incorrect data usage reported

this is on my xfinity mobile devices data usage

That is a fantastic question! I can definitely understand your concern. Just to clarify, are we discussing the data usage for your home internet plan or would this be in regards to your cellular data with our Xfinity Mobile service?

I have a similar issue... my daughter's phone says 89.0MB, and Xfinity Mobile says 1.86GB...

I tried the online chat and it was brushed off as 'must be the device, bring it to apple care'

Just curious, and for further clarification, you are talking about Wi-Fi data usage only since you say that cellular data is turn off?

And are you saying it is shows that usage for just the current measurement period?

(as opposed to a cumulative amount being compared to a current period amount)

And since you are talking about a mobile phone(s), do you ever use the phone(s) at any other locations?

The mobile phone(s) will measure all Wi-Fi data usage accessed from all locations, not just your house, any time you are connected to a Wi-Fi access point.

Hi Chrisp1974, sorry my questions were directed to original post by tbenjam as he was asking only about W-Fi data usage since he said cellular data was turned off.

And in your original reply you didn't distinguish between Wi-Fi data usage or cellular (mobile) data usage. So I wasn't sure what to ask. I agree that what you are saying can be confusing.

For cellular data usage you should be able to look at what apps had access to cellular data and what amount of cellular data each app used. Add those amounts and you should get something close to what the phone is reporting as the the total cellular data used for the period. When I do this on my mobile (I have a Samsung Galaxy S8+) it always adds up to close to what the phone shows as the total cellular data used. If that isn't the case, then there would appear to be an issue somewhere.

With the cellular data turned off have you noticed if the phone is still reporting the amount of cellular data usage going up?

And if it is, have to checked to see which apps are reporting any increases? You would need to write down all cellular data usage by apps at a given time and date, then monitor that over some period of time (several days to weeks) to see if you notice any discrepancies.

And finally what the phone shows for cellular data usage should match what Xfinity Mobile is reporting for that same period (or at least fairly close). If that isn't the case it is extremely odd. I would say it may be a phone related problem also, but not sure what kind of issue or how to fix it.

And I assume since Xfinity Mobile is reporting a lower amount that at least you aren't being billed for huge cellular data usage that isn't being used in reality.

Check again...lol...the phone says 89MB consumed.... Xfinity says 1.86GB...which is why it is a concern...

We haven't been able to identify what is using the data, so she has disabled cellular data altogether now...although that's not an ideal solution

I am not concerned with the amount of WiFi data usage on the phone...it is the cellular usage that contributes to the monthly billable amount.

We had limited the apps that had access to cellular data, but it appears that data was still being consumed by the phone somehow...during the billing period there was a serious discrepancy between the amount of cellular data that the phone says it has consumed vs. what Xfinity is indicating was consumed by the device...

For now, my daughter is completely disabling her data unless she needs to use it to avoid the unexpected overage, or an explanation can be provided.

Oops, Chrispy1974, got it. My bad, should have looked closer at the Mbs and Gbs.

Not sure why Xfinity Mobile would be reporting usage that much higher than the mobile phone actually shows.

I have seen small amounts (less that 1Gb) that don't add up for cellular data usage and assume it's the OS using cellular data when I have done restarts, etc. When I restart my mobile it always uses cellular data to connect to the towers before it ever enables Wi-Fi. And I have noticed that the Google Play store always uses small amounts of cellular data even when I have the phone set to always use Wi-Fi when I'm connected to Wi-Fi. Have never ben able to figure out why that occurs. I think the way to force a mobile to not use cellular data is to disable it. I assume that other apps may be doing the same. But none of that explains why Xfinity Mobile still reports much higher usage than the phone shows.

Right now on my mobile it shows a little more mobile data used than Xfinity Mobile reports, but that may be that the monthly switchover time for the billing period isn't quite the same on the phone as to what Xfinity Mobile uses (I'm not sure you can set that exactly) and they do say there can be a 6 hour lag in updating their site reporting amount.

Might that be what you are seeing?

I am having the same issue. My bill shows .89 and my useage is showing .44. I

I have a similar experience, before one night my mobile cellular data was 0.61 Gb, next morning I am received email that my data is over my limit 2.5 Gb!  That’s just overnight with me sleeping and having home WiFi?!  it’s just impossible.
I tried to solve this by chatting and phone call with customer service, but no explanation and no credit. This happening for a second billing period that why I was carefully watching my data usage this time. My conclusion is here: FRAUD !

I am having a similar problem.

I have given my 3 kids an allotment of 100Mb of data or they have to pay for going over, so they are very aware of how much data they use.  My wife and I each get 350Mb.

My daughter's phone shows .04Gb data (not wifi) used, and my bill shows .28Gb

I can prove every month Xfinity pads your usage 20-30% over what you are using. I installed packet sensor at border of my network and for the last year it shows Xfinity padding my usage 25% higher.  Every month I call support to get refund and every month they tell me it won't happen again and confirm my usage is wrong on their end.  Xfinity is making millions off non-technical customers across the US...and loving it. 

Same thing here! Only a few days into a new cycle I received a notification that I had used 50% and would I like to change my plan. A couple of days later, another notification that I had used 80%. According to my cell phone information - cell data was half of the numbers that Xfinity Mobile app was showing. Contacted Xfinity Mobile (which in itself is a pain) and after talking with four different people, they will be giving me a credit for 1gig of data. Now for whatever reasons, my cell data when viewed in XM app shows miminal usage since my phone call to XM. Told them I will be keeping on eye on this from here on out.