On the Web. You're using your mobile data whenever you're not connected to WiFi and doing things like browsing the web, checking social media, sending iMessages, and streaming videos. For all - the link below and my post above has some general information on how to avoid overage charges and tips to conserve data usage:https://www.xfinity.com/support/articles/data-usage-avoid-overage-charges. WHY? There are just a few common causes of high data usage you may not be aware of. My numbers don't match with a framerate/bandwidth calculation. Get the most out of Xfinity from Comcast by signing in to your account. Seeing this thread brings me a little comfort to know that I'm not the only one having this issue. Fast forward to today (12/8/19) and I have spent 10hrs of my time trying to solve the issues. As of 1pm today I'm at 216 GB and will have to find a solution before the 20th of Dec. or I'll be charged BIGGLY. If you take the time to use the Xfinity Data Estimator, you will discover something fascinating, just like we did. In reviewing your account, I can see data usage from June through November averaged about 582 gb/month. Streaming 4K HDR content would use a lot of data compared to a previous month (prior to Disney Plus). Hi, my Comcast Xfinity usage went from about 500 GB per month to well over 1 TB per month, and the only change I made was adding several Sonos speakers. I have downloaded games and other files which have beeb accurately represented in the UniFi controller. A Gartner report indicates that the 2015 growth of total cellular data usage will be 59%. I can appreciate many of the comments by CC employees and others regarding causes apart from Comcast, such as "cloud synching", constantly running updating, etc., on i-Devices,  and anything else particular to the customer's own connected devices. Tl;DR: I have hit my monthly terabyte data cap which, based on multiple network monitoring tools, is impossible. Otherwise, they should simply offer unlimited data only and be done with it. Either way, it's bad business. This may not be the only answer to all of the recent concerns noted here but it could be part of the answer for some of these concerns based on the timing of Disney Plus. Why? Moreover, many affected customers can actually monitor data usage through their router options (as we did), and clearly demonstrate a huge disparity between daily data counts logged by CC v. the respective routers numbers. Have you had the opportunity to review the link above? Switched because of terible service. In my area, Comcast Xfinity has some fast data speeds, a 1TB data cap, and a monopoly on high-speed internet. Now in 3 days in December we are at 158 GB already which puts us on pace for 1632 GB. When I called customer service in July with $200 in overages she gave me the new Xfinity one with new remotes,boxes utube,netflix etc plus extra data all at a lower price than I had been paying. In digging into things a bit more, I would offer a suggestion to you, the Xfinity team, and to others here in the forum, that one possible cause - and has been reported elsewhere on the internet - is that Disney+ was reported to be driving high bandwidth usage. Does Xfinity have data caps? "I watched my meter and it went up by 100GB in the last 3 hours and I just booted up my computer for 15 minutes!" For years, my average usage per month was 3.5 GB. I went in and picked up Xfinity box to pin down culprits. Usage is still high about 40-50GB a day. Of course I have looked at your “tips”. It does not apply to Xfinity Internet customers on our Gigabit Pro tier of service, Business Internet customers, customers with Prepaid Internet, or customers on Bulk Internet agreements." I'm certainly not ruling this option out yet though. For the last 30 days my Glasswire installation has used a total of 190KB. Check your Xbox for a stuck download or update. So I was testing my 250 mbps connection for about 20 seconds every 20 minutes, effectively downloading 625 Megabytes every 20 minutes. The increase is staying. Hey u/TenThousandTabs, this would actually be something better suited for discussion with our Security Assurance team. I am just under 600GB as of December 3, 2019 (only 3 days!). In fact, my nest cam uses more bandwidth. No way we are using close to that. Remote device changes as well to conserve a bit more data. Cats are pretty smart though. Need more? My data usage soared from 385GB to over the 1024 GB limit in October and close to that in November. Scroll down and find the section about the data estimator. Should any one of them pick up a service or port you are not on top of,  or something your cable modem responds to, you could be getting hammered from multiple locations in a few minutes botnet style. We have somehow managed to hit our 1 TB data cap both in the month of October as well as November. Advanced Class:  Install Snort (adaptive firewall). My usage … My use? Less now, but you should be if you can't see every device on your network, and unsolicited foreign IP contacts. I cannot use their XFi app to further monitor devices on our network as I do not have any xfinity components in my network, nor do I want them. He also told me that while there has not been an official recognition that a similar issue to what happened in the September timeframe, based on the number of calls he has been experiencing on this topic, he would not be surprised if there actually were a similar issue. The guy I spoke with had such a thick accent, talked in a low voice, and spoke too quickly to fully understand. I just cut them off at 4Mbps and they'll play just fine at 1080p. Apologies for the issue and the experience that you described above. Even after the the billing software change was rolled back, I am still seeing excessively high usage reported by Comcast. For the last 30 days my Glasswire installation has used a total of 190KB. There could be an error in the billing system, and in fact no other explanation makes sense. If I find anything I'll be sure to report back. Also performed external port checks on this cable modem and it's as secure as they get. Anyone know how to get history of data usage further back? No outside interferance according to the tech and on monitoring the modem/router through their app.. Will now check prices for Verizon (as they are my current phone data provider ) to see a finale price for service to run 1 laptop and 3 tvs from them. I'm suspecting it's Disney+ and there needs to be a resolution on this. Thanks for your patience. I'll get a really good hi-def stream, but then it will downshift streams and the video will be choppy. Looks like I'm gonna go over 1 terabyte in DEC.. FYI, I bought my own Netgear router but Comcast would not let me install so their tech came and installed. Other providers, such as Cox and Xfinity have similar apps, and you can likely also monitor your data usage from your provider’s website. The earlier referenced issue with the data meter was resolved and corrected. That is a lot of data in a very short period of time. 448GB = New firewall ruleset. What can you realistically pull from a streaming service? Now I have switched off Mobile data not to go over my monthly limit. The increase is staying. What causes high data usage; cancel. Comcast National Data Cap. That's where pfsense comes in. I’ve suspected a similar experience on my account. In fact I left the call feeling like it was my fault for not monitoring my data usage daily or for using my own modem rather than Comcast’s. Two months ago we hit 680 GB in one month. So I'm stuck battling against the behemoth. Okay, that's not true, but let's go with that for this example. You may have to send a free text message to a special number or go to a web site, but you can definitely find out how much of your data plan you have used so far. Document. I’ve had that issue and they swore it was me. Netflix can run a bit higher with burst traffic up to 6Mbps. There hasn't been any firmware or hardware change on my end since July.". What does that leave? It may help. This wouldn't be so peculiar to me if it followed my normal usage trends. At this time, most forum responses and verbal responses via phone are putting the blame on customers instead of realizing there are way too many complaining of the same issue to be the customers fault, Re: Data Usage has doubled over the past month and a half. I called them to fix the issue and they refused saying they tested the meter and it was fine. Re: Unexplained High Data Usage ALL OF A SUDDEN Glasswire itself uses nearly no data, so I don't understand what you mean when you say "it eats a lot of data." My data usage jumped in June, right after I added a NAS, then went over in July. Only my wife and I are in the house, no children. "As of January 1, 2021, the plan will be available nationally. Suggestion is to log into your router to see and verify all the devices connected to your network" (very applicable with customer owned devices). I noticed today that an Xfinity worker was outside my home today. Comcast data metering accuracy reports at the link below:https://www.netforecast.com/comcast-internet-usage-accuracy-reports/. This is only the 3rd day of December and I am through half of my monthly Terrabyte allocation at 516 GB. In digging into things a bit more, I would offer a suggestion to you, the Xfinity team, and to others here in the forum, that one possible cause - and has been reported elsewhere on the internet - is that Disney+ was reported to be driving high bandwidth usage. But this can explain why it does not show up thru your router or any monitoring tools associated with the modem/router. - Similarly could be done for other devices, ex: “Go into Netflix settings and make sure that it pauses after not watching it for a while”, etc.Overall:There is no trend or consistency indicating an issue in metering, but rather these have all been unique issues per network requiring the subscriber to troubleshoot/review their network. It gets disabled on its own by enabling the metered connection. To identify data usage on a per-app basis, you get to do the work of comparing and figuring out which is the greediest. "I watched my meter and it went up by 100GB in the last 3 hours and I just booted up my computer for 15 minutes!" 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Our metering system is regularly audited as well where information on it can be gathered from https://www.netforecast.com/. Everyone, we are still experiencing issues even after being offered credit and removing late fee. I guess that's a good idea from now on and probably always was in the first place. In reviewing your account, I can see data usage growing steadily each month from July through November. I'm a senior with no cell phone so very dangerous position to put a person living alone in. Now the question:  What does Xfinity count? After our experiences in October, we now check our account religiously every few days to monitor data usage assigned v. household viewing/streaming online hours actually logged. Most Xfinity plans have a 1,024 GB data cap. 2.5Mbps (Mega Bit Per Second) = 1.13GB/hour (Gigabytes per hour). Thankfully, no deviations noted, but remain vigilant. That's it. Comcast support was terrible. As mentioned, our team will review and make contact with you. 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