Japan
Opensignal is the independent global standard for analyzing consumers' connectivity experiences. Our industry reports are the definitive guide to understanding what happens when people use their mobile and broadband connections in their daily life.
Japan
Opensignal is the independent global standard for analyzing consumers' connectivity experiences. Our industry reports are the definitive guide to understanding what happens when people use their mobile and broadband connections in their daily life.
Key Findings
au achieves a clean sweep for experiential awards in Japan
In this report, au breaks out of a statistical tie it was in with SoftBank for 5G Video Experience, winning the award outright with a score of 77.8 points on a 100-point scale. As a result, au is now the sole winner of all of Opensignal’s experiential awards, both in the overall and 5G sections — Video Experience, Live Video Experience, Games Experience and Voice App Experience.
NTT Docomo triumphs for 5G Download Speed but au retains Download Speed Experience
Due to an increase in its score of 21Mbps, NTT docomo pulls ahead of the previous outright winner Rakuten Mobile and claims 5G Download Speed with a score of 168Mbps. However, our au users continue to enjoy the fastest average overall download speeds, clocking in at 55.8Mbps, while NTT docomo comes second.
SoftBank claims 5G Availability all to itself
In the previous report, au and SoftBank shared the top spot on the podium for 5G Availability — but this time, SoftBank is the sole winner of this award due to an increase in its score of four percentage points. SoftBank’s winning score means that our 5G users on its network spend 16.2% of their time with an active 5G connection.
Rakuten Mobile holds both upload speed awards in a firm grip
Rakuten Mobile traditionally dominates the Upload Speed Experience and 5G Upload Speed awards. It wins in these categories outright with scores of 15.9Mbps and 26.2Mbps respectively, commanding sizable winning margins over second-placed SoftBank in both cases.
au retains Reliability Experience
Reliability Experience remains in au’s hands, as the operator wins the award for the second time in a row, this time, with a score of 951 points on a 100-1000 point scale. SoftBank comes second, 12 points behind the outright winner — but it has seen the highest increase in its score since the previous report, of 17 points.
au leads the regional award count in Japan
Across Japanese regions, au collects the most awards — 43 outright and 39 jointly, with the bulk of its wins coming from experiential metrics and Reliability Experience. The operator achieves a clean sweep for Games Experience and 5G Games Experience. Rakuten Mobile collects all the regional awards outright for Upload Speed Experience and 5G Upload Speed, while SoftBank does the same for 5G Availability.
Mobile Experience Awards
Market Overview
In Opensignal's latest Japan Mobile Network Experience report, au leads the national award count, with 10 recognitions won outright and one jointly. NTT docomo secures three awards outright and one jointly — this includes 5G Download Speed, which the operator claims this time around. Rakuten Mobile confirms its supremacy for upload speeds, winning both Upload Speed Experience and 5G Upload Speed awards — while SoftBank takes home 5G Availability.
Japanese operators continue to improve their infrastructural ability to provide 5G services. SoftBank has secured 100MHz of spectrum in the 4.9-5GHz range, which will improve its capacity, leading to improvement of users’ mobile experience. Meanwhile, Rakuten Mobile has said that it has more than doubled its 5G coverage in the Kanto region, using sub-6GHz spectrum.
In this report we examine the mobile network experience of the four main mobile network operators in Japan — au, NTT docomo, Rakuten Mobile and SoftBank — over a period of 90 days starting on January 1, 2025, and ending on March 31, 2025, to see how they fared.
Opensignal reports include main brand experience only, sub-brands are not included. However, NTT docomo's other price plans (eximo, ahamo & irumo) are included in its scores. Our metrics include all user measurements reported across all mobile technologies including when users have exceeded their data allowance — and NTT docomo’s data included 3G.
Overall Experience
National Analysis
au successfully maintains its hold on the Video Experience award with a score of 73.9 points on a 100-point scale, beating the runner-up SoftBank by one point.
Regardless of their choice of an operator, our Japanese users enjoy a Very Good (68-78) Video Experience. This means that our users are, on average, able to stream video at 1080p or better with satisfactory loading times and little stalling.
Video Experience scores account for adaptive bitrate streaming (ABR), a technology that allows Opensignal to accurately represent users' real video experience including video streams up to 4K quality.
Definitions
Opensignal’s Video Experience quantifies the quality of video streamed to mobile devices by measuring real-world video streams over an operator's networks. The metric is based on an International Telecommunication Union (ITU) approach, built upon detailed studies which have derived a relationship between technical parameters, including picture quality, video loading time and stall rate, with the perceived video experience as reported by real people. To calculate video experience, we are directly measuring video streams from end-user devices and using this ITU approach to quantify the overall video experience for each operator on a scale from 0 to 100. The videos tested include a mixture of resolutions — including Full HD (FHD) and 4K / Ultra HD (UHD) — and are streamed directly from the world’s largest video content providers.
In addition to Video Experience, we report on the following metrics related to video experience:
- 5G Video Experience: The average Video Experience of Opensignal users when they were connected to an operator’s 5G network.
- Video Experience – 5G Users: The average Video Experience of Opensignal users with a 5G device and a 5G subscription across an operator's networks. It factors in 2G, 3G, 4G and 5G video experience along with the availability of each technology.
- 4G Video Experience: The average Video Experience of Opensignal users on an operator's 4G network.
- 3G Video Experience: The average Video Experience of Opensignal users on an operator’s 3G network.
National Analysis
Once again, au wins the Live Video Experience award outright, this time with a score of 69.4 points on a 100-point scale.
All operators place in the Excellent (58 or above) category — our users are, on average, able to stream video at least at 1080p with low loading times, little stalling and a satisfactory live offset.
Operators’ Live Video Experience scores are determined using a range of measures that impact users’ perceived live streaming viewing experience, including picture quality, video loading time, and stall rate, but also live playback offset — the time difference between real-time and the current playback position a viewer sees.
Unlike Video Experience, which represents on-demand video streams, Live Video Experience quantifies live video streaming used for current events. For example when users watch live sports, game streams, music concerts, or news where the event is happening at that moment in time.
Definitions
Opensignal’s Live Video Experience quantifies the quality of real-time video streamed to mobile devices by measuring video streams over an operator's network. The metric extends the existing International Telecommunication Union (ITU) approach used for Opensignal's on-demand Video Experience metric, built upon detailed studies which have derived a relationship between technical parameters, including live playback offset, picture quality, video loading time and stall rate, with the perceived live video experience as reported by real people. To calculate live video experience, we are directly measuring live video streams from end-user devices and using this extension of ITU's approach to quantify the overall live video experience for each operator on a scale from 0 to 100. The videos tested include a mixture of resolutions and are streamed directly from the world’s largest video content providers.
National Analysis
The Games Experience award remains in au’s firm grip, as the operator wins the recognition with a score of 86.8 points on a 100-point scale, three points ahead of second-placed SoftBank. NTT docomo sees the highest increase in its score across all of Japan’s operators — of three points.
au achieves an Excellent (85 or above) rating, while NTT docomo, SoftBank and Rakuten Mobile place one category lower, in Good (75-85). An Excellent (85 or above) rating means that the vast majority of users deem this network experience acceptable. Nearly all users feel like they have control over the game and they receive immediate feedback on their actions. There is not a noticeable delay in almost all cases.
Definitions
Opensignal’s Games Experience measures how mobile users experience real-time multiplayer mobile gaming on an operator’s network. Measured on a scale of 0-100, it analyzes how our users’ multiplayer mobile gaming experience is affected by mobile network conditions including latency, packet loss and jitter.
Games Experience quantifies the experience when playing real-time multiplayer mobile games on mobile devices connected to servers located around the world. The approach is built on several years of research quantifying the relationship between technical network parameters and the gaming experience as reported by real mobile users. These parameters include latency (round trip time), jitter (variability of latency) and packet loss (the proportion of data packets that never reach their destination). Additionally, it considers multiple genres of multiplayer mobile games to measure the average sensitivity to network conditions. The games tested include some of the most popular real-time multiplayer mobile games (such as Fortnite, Pro Evolution Soccer and Arena of Valor) played around the world.
Calculating Games Experience starts with measuring the end-to-end experience from users’ devices to internet end-points that host real games. The score is then measured on a scale from 0 to 100.
In addition to Games Experience, we report on the following metrics related to games experience:
- 5G Games Experience: The average Games Experience of Opensignal users when they were connected to an operator’s 5G network.
- Games Experience – 5G Users: The average Games Experience of Opensignal users with a 5G device and a 5G subscription across an operator's networks. It factors in 2G, 3G, 4G and 5G games experience along with the availability of each technology.
- 4G Games Experience: The average Games Experience of Opensignal users on an operator's 4G network.
- 3G Games Experience: The average Games Experience of Opensignal users on an operator's 3G (e.g. UMTS/HSPA or CDMA 1X EV-DO) network.
National Analysis
au triumphs for Voice App Experience once again, with a score of 83.9 points on a 100-point scale.
All operators place in the Good (80-87) category. This means many users are satisfied but some experience minor quality impairments. For example, clicking sounds or distortion are very rarely present.
Definitions
Opensignal's Voice App Experience measures the quality of experience for over-the-top (OTT) voice services — mobile voice apps such as WhatsApp, Skype and Facebook Messenger — using a model derived from the International Telecommunication Union (ITU) approach for quantifying overall voice call quality and a series of calibrated technical parameters. This model characterizes the exact relationship between the technical measurements and perceived call quality. Voice App Experience for each operator is calculated on a scale from 0 to 100.
In addition to Voice App Experience, we report on the following metrics related to voice app experience:
- 5G Voice App Experience: The average Voice App Experience of Opensignal users when they were connected to an operator’s 5G network.
- Voice App Experience – 5G Users: The average Voice App Experience of Opensignal users with a 5G device and a 5G subscription across an operator's networks. It factors in 2G, 3G, 4G and 5G voice app experience along with the availability of each technology.
- 4G Voice App Experience: The average Voice App Experience of Opensignal users on an operator's 4G network.
- 3G Voice App Experience: The average Voice App Experience of Opensignal users on an operator's 3G (e.g. UMTS/HSPA or CDMA 1X EV-DO) network.
National Analysis
Our au users continue to enjoy the fastest average overall download speeds, clocking in at 55.8Mbps. NTT docomo comes second, around 1Mbps behind the winner. SoftBank has seen the biggest increase in Download Speed Experience score since the previous report, of 11Mbps — followed by NTT docomo's rise of 7Mbps.
Definitions
Measured in Mbps, Download Speed Experience represents the typical everyday speeds a user experiences across an operator’s mobile data networks.
In addition to Download Speed Experience, we report on the following metrics related to download speeds:
- 5G Download Speed: The average download speed observed by Opensignal users with active 5G connections.
- Download Speed Experience – 5G Users: The average download speeds experienced by Opensignal users with a 5G device and a 5G subscription across an operator’s networks. It factors in 2G, 3G, 4G, and 5G download speeds along with the availability of each technology.
- 4G Download Speed: The average downlink speed observed by Opensignal users when they were connected to 4G.
- 3G Download Speed: The average downlink speed observed by Opensignal users when they were connected to 3G (e.g. UMTS/HSPA or CDMA 1X EV-DO).
National Analysis
Rakuten Mobile dominates the Upload Speed Experience category, winning it outright with a score of 15.9Mbps and commanding a lead of 7Mbps over second-placed SoftBank.
Definitions
Upload Speed Experience measures the average upload speeds for each operator observed by our users across their mobile data networks. Typically upload speeds are slower than download speeds, as current mobile broadband technologies focus resources on providing the best possible download speed for users consuming content on their devices. As mobile internet trends move away from downloading content to creating content and supporting real-time communications services, upload speeds are becoming more vital and new technologies are emerging that boost upstream capacity.
In addition to Upload Speed Experience, we report on five supporting metrics related to upload speeds:
- 5G Upload Speed: The average upload speed observed by Opensignal users with active 5G connections.
- Upload Speed Experience – 5G Users: The average upload speeds experienced by Opensignal users with a 5G device and a 5G subscription across an operator’s networks. It factors in 2G, 3G, 4G, and 5G upload speeds along with the availability of each technology.
- 4G Upload Speed: The average uplink speed observed by Opensignal users when they were connected to 4G.
- 3G Upload Speed: The average uplink speed observed by Opensignal users when they were connected to 3G (e.g. UMTS/HSPA or CDMA 1X EV-DO).
Regional Analysis
Regional Analysis Summary: Japan, Mobile Network Experience Report, April 2025
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5G Experience
National Analysis
In this report, au breaks out of a statistical tie it was in with SoftBank for 5G Video Experience. It wins the award outright with a score of 77.8 points on a 100-point scale, beating the previous joint winner SoftBank by one point.
All Japanese operators rate as Very Good (68-78) — this means that our users are, on average, able to stream video at 1080p or better with satisfactory loading times and little stalling when connected to 5G.
5G Video Experience scores account for adaptive bitrate streaming (ABR), a technology that allows Opensignal to accurately represent users' real video experience including video streams up to 4K quality.
Definitions
5G Video Experience quantifies the quality of mobile video experienced by Opensignal users on real-world video streams when they were connected to 5G. The metric is based on an International Telecommunication Union (ITU) approach, built upon detailed studies which have derived a relationship between technical parameters, including picture quality, video loading time and stall rate, with the perceived video experience as reported by real people. To calculate 5G Video Experience, we are directly measuring video streams from end-user devices and using this ITU approach to quantify the video experience observed by our users on each operator’s 5G network on a scale from 0 to 100. The videos tested include a mixture of resolutions — including Full HD (FHD) and 4K / Ultra HD (UHD) — and are streamed directly from the world’s largest video content providers.
National Analysis
Once again, the 5G Live Video Experience award goes to au, which wins it outright with a score of 73.8 points on a 100-point scale. SoftBank comes second, one point behind the outright winner.
Regardless of the operators they are subscribed to, our Japanese users enjoy an Excellent (58 or above) 5G Live Video Experience. They are, on average, able to stream video at least at 1080p with low loading times, little stalling and a satisfactory live offset when connected to 5G.
Operators’ 5G Live Video Experience scores are determined using a range of measures that impact users’ perceived live streaming viewing experience, including picture quality, video loading time, and stall rate, but also live playback offset — the time difference between real-time and the current playback position a viewer sees.
Unlike 5G Video Experience, which represents on-demand video streams, 5G Live Video Experience quantifies live video streaming used for current events. For example when users watch live sports, game streams, music concerts, or news where the event is happening at that moment in time.
Definitions
Opensignal’s Live Video Experience quantifies the quality of real-time video streamed to mobile devices by measuring video streams over an operator's network. The metric extends the existing International Telecommunication Union (ITU) approach used for Opensignal's on-demand Video Experience metric, built upon detailed studies which have derived a relationship between technical parameters, including live playback offset, picture quality, video loading time and stall rate, with the perceived live video experience as reported by real people. To calculate live video experience, we are directly measuring live video streams from end-user devices and using this extension of ITU's approach to quantify the overall live video experience for each operator on a scale from 0 to 100. The videos tested include a mixture of resolutions and are streamed directly from the world’s largest video content providers.
5G Live Video Experience quantifies the quality of mobile video experienced by Opensignal users on real-world live video streams when they were connected to 5G.
National Analysis
au confirms its supremacy for 5G Games Experience and wins the award outright again, this time with a score of 92.1 points on a 100-point scale and a lead of three points over second-placed SoftBank.
Both au and SoftBank rate as Excellent (85 or above) while NTT docomo and Rakuten Mobile place one category lower, in Good (75-85). An Excellent (85 or above) rating for au and SoftBank means that the vast majority of users deem this 5G network experience acceptable. Nearly all users feel like they have control over the game and they receive immediate feedback on their actions. There is not a noticeable delay in almost all cases.
Definitions
5G Games Experience measures how mobile users experience real-time multiplayer mobile gaming on an operator's 5G network. It analyzes how our users’ multiplayer mobile gaming experience was affected by mobile network conditions including latency, packet loss and jitter. 5G Games Experience for each operator is calculated on a scale from 0 to 100.
5G Games Experience quantifies the experience when playing real-time multiplayer mobile games on mobile devices connected to servers located around the world. The approach is built on several years of research quantifying the relationship between technical network parameters and the gaming experience as reported by real mobile users. These parameters include latency (round trip time), jitter (variability of latency) and packet loss (the proportion of data packets that never reach their destination). Additionally, it considers multiple genres of multiplayer mobile games to measure the average sensitivity to network conditions. The games tested include some of the most popular real-time multiplayer mobile games (such as Fortnite, Pro Evolution Soccer and Arena of Valor) played around the world. Calculating 5G Games Experience starts with measuring the end-to-end experience from users’ devices to internet end-points that host real games.
National Analysis
Once again, au comes first for 5G Voice App Experience, this time with a score of 85.4 points on a 100-point scale, beating SoftBank by one point.
All operators achieve the Good (80-87) rating for 5G Voice App Experience. This means many users are satisfied but some experience minor quality impairments. For example, clicking sounds or distortion are very rarely present.
Definitions
5G Voice App Experience quantifies the experience of Opensignal users when using over-the-top voice apps — such as WhatsApp, Skype and Facebook Messenger — on an operator’s 5G network. It uses a model derived from the International Telecommunication Union (ITU) approach for quantifying overall voice call quality and a series of calibrated technical parameters. This model characterizes the exact relationship between the technical measurements and perceived call quality. 5G Voice App Experience for each operator is calculated on a scale from 0 to 100.
National Analysis
Due to a 21Mbps increase in its score, NTT docomo pulls ahead of the previous outright winner Rakuten Mobile and claims 5G Download Speed with a score of 168Mbps. Rakuten Mobile and au share second place, with statistically tied scores of 163-164.1Mbps.
Definitions
5G Download Speed shows the average download speed experienced by Opensignal users across an operator’s 5G network. 5G Download Speed for each operator is calculated in Mbps (Megabits per second).
National Analysis
Rakuten Mobile remains the sole winner of the 5G Upload Speed award, with a score of 26.2Mbps and with a winning margin of 9Mbps over the runner-up SoftBank.
Definitions
5G Upload Speed measures the average upload speeds experienced by Opensignal users across an operator’s 5G network. 5G Upload Speed for each operator is calculated in Mbps (Megabits per second).
Regional Analysis
Regional Analysis Summary: Japan, Mobile Network Experience Report, April 2025
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Coverage
National Analysis
NTT docomo continues to lead for Coverage Experience award with a score of 9.1 points on a 10-point scale, one point ahead of au. This score means NTT docomo has the widest and largest geographic footprint of coverage in populated areas out of all mobile operators in Japan.
Definitions
The Opensignal Coverage Experience metric measures the extent of mobile networks in the places people live, work and travel. The metric represents the experience users receive as they travel around areas where they would reasonably expect to find coverage.
Traditional coverage metrics typically estimate either a percentage of land area covered, or a percentage of population covered; often neither will be an accurate measurement of the true user expectation and experience. In many markets there are areas where neither population density nor geographic area reflect the importance of coverage to users. For example, in a large mountain range most users will not expect coverage in the wilderness, but poor coverage in the relatively small area of a ski resort is critical for the enjoyment of a holiday. Estimates based purely on population give undue significance to coverage in the most densely populated areas.
Coverage Experience measures geographic coverage of populated areas and therefore more accurately reflects the coverage expectations and experience of typical users. It can give a result that is somewhat different to traditional estimates based on either geographic or population measures. The metric uses a scale from 0 to 10.
National Analysis
NTT docomo retains the 5G Coverage Experience award with a score of 4.6 points on a 10-point scale, one point ahead of second-placed au. All operators have observed increases in 5G Coverage Experience since the previous report, which reflects the growing footprints of their 5G networks in Japan’s populated areas.
Definitions
The Opensignal Coverage Experience metric measures the extent of mobile networks in the places people live, work and travel. The metric represents the experience users receive as they travel around areas where they would reasonably expect to find coverage.
Traditional coverage metrics typically estimate either a percentage of land area covered, or a percentage of population covered; often neither will be an accurate measurement of the true user expectation and experience. In many markets there are areas where neither population density nor geographic area reflect the importance of coverage to users. For example, in a large mountain range most users will not expect coverage in the wilderness, but poor coverage in the relatively small area of a ski resort is critical for the enjoyment of a holiday. Estimates based purely on population give undue significance to coverage in the most densely populated areas.
Coverage Experience measures geographic coverage of populated areas and therefore more accurately reflects the coverage expectations and experience of typical users. It can give a result that is somewhat different to traditional estimates based on either geographic or population measures. The metric uses a scale from 0 to 10.
5G Coverage Experience shows the proportion of places Opensignal users with a 5G device and a 5G subscription had an active 5G connection.
National Analysis
The statistical tie between au and NTT docomo for Availability continues, as both operators win the award with identical scores of 99.7%. These scores represent the proportion of time Opensignal users spend with a 5G, 4G or 3G mobile signal.
Definitions
Our availability metrics are not a measure of a network’s geographical extent. They won’t tell you whether you are likely to get a signal if you plan to visit a remote rural or nearly uninhabited region. Instead, they measure what proportion of time people have a network connection, in the places they most commonly frequent — something often missed by traditional coverage metrics. Looking at when users have a connection rather than where, provides us with a more precise reflection of the true user experience.
We also keep track of the instances that leave mobile users most frustrated: when there is no signal to connect to at all. The most common dead zones users struggle with occur indoors. As most of our availability data is collected indoors (as that’s where users spend most of their time), we’re particularly astute at detecting areas of zero signal.
Our availability metrics take a user-centric, time-based approach that complements the user-centric and geographical-based methodology used by our reach metrics.
Availability shows the proportion of time all Opensignal users on an operator’s network had either a 3G, 4G or 5G connection.
National Analysis
In the previous report, au and SoftBank shared the top spot on the podium for 5G Availability — but this time, SoftBank becomes the sole winner of this award due to an increase in its score of four percentage points. SoftBank’s winning score means that our 5G users on its network spend 16.2% of their time with an active 5G connection. Rakuten Mobile also sees an improvement in its 5G Availability score, of three percentage points.
Definitions
Our availability metrics are not a measure of a network’s geographical extent. They won’t tell you whether you are likely to get a signal if you plan to visit a remote rural or nearly uninhabited region. Instead, they measure what proportion of time people have a network connection, in the places they most commonly frequent — something often missed by traditional coverage metrics. Looking at when users have a connection rather than where, provides us with a more precise reflection of the true user experience.
We also keep track of the instances that leave mobile users most frustrated: when there is no signal to connect to at all. The most common dead zones users struggle with occur indoors. As most of our availability data is collected indoors (as that’s where users spend most of their time), we’re particularly astute at detecting areas of zero signal.
Our availability metrics take a user-centric, time-based approach that complements the user-centric and geographical-based methodology used by our reach metrics.
5G Availability shows the proportion of time Opensignal users with a 5G device and a 5G subscription had an active 5G connection.
Regional Analysis
Regional Analysis Summary: Japan, Mobile Network Experience Report, April 2025
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Consistency
National Analysis
Reliability Experience remains in au’s hands, as the operator wins the award for the second time in a row, this time, with a score of 951 points on a 100-1000 point scale. SoftBank comes second, 12 points behind the outright winner — but it has seen the highest increase in its score since the previous report, of 17 points.
Opensignal’s Reliability Experience measures the ability of our users to connect to and successfully complete basic tasks on operators’ networks. It consists of the following components:
a) Signal Availability — the proportion of time Opensignal users can successfully receive mobile network signal,
b) Data Connectivity — the proportion of time when the network is available and the device can connect to the internet,
c) Task Completion — whether tasks initiated by the user’s device are completed,
d) Sufficiency — the probability that (basic) tasks will be executed sufficiently well for the user.
Definitions
Opensignal’s Reliability Experience measures the ability of Opensignal users to connect to and successfully complete (basic) tasks on communication service providers’ (CSP) networks. It analyzes how much Opensignal users’ experience is affected by the radio access and core network, along with issues that prevent them from connecting to the internet even if they have a connection to their CSP’s network. It also factors in users’ ability to successfully use lower performance applications including SD video, over-the-top voice calls and web browsing.
Regional Analysis
Regional Analysis Summary: Japan, Mobile Network Experience Report, April 2025
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Related Analysis
Our Methodology
Collecting billions of individual measurements daily from over 100 million devices globally, Opensignal independently analyzes mobile and broadband user experience on every major network operator around the globe.
About Opensignal
Opensignal is the leading global provider of independent insights into consumers' connectivity experiences and choice of carrier. Our proprietary insights into mobile and broadband networks give operators the solutions they need to profitably compete and win, from executive level scorecards and public validation to pin-point level engineering analytics and consumer decision dynamics.
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Confidence Intervals
For every metric we calculate statistical confidence intervals indicated on our graphs. When confidence intervals overlap, our measured results are too close to declare a winner. In those cases, we show a statistical draw. For this reason, some metrics have multiple operator winners.
In our bar graphs we represent confidence intervals as boundaries on either sides of graph bars.
In our supporting-metric charts we show confidence intervals as +/- numerical values.
Why confidence intervals are vital in analyzing mobile network experience