Did they start at the same time?
Keep in mind some apps don't declare their usage accurately. For example once in a while Facebook for me will not display it's usage. I know it has usage because I use it for about an hour a day. It'll show up 2 days later and show I used 10MB even if I know it is more than that(most videos are larger than that).
This is the main reason Google gives a disclaimer on their tool to say it'll show differently from carriers usage
That is not the case here. The app is showing more data usage then the phone so the delay theory doesn't work. Also this is what is used to determine my dill so it better be accurate
Showing up 2 days later isn't a delay? Also r u referencing this to be the case on what ure phone is showing for data usage or the data used in the Facebook app?
Reread it again please. It isn't about a delay. It's about some apps not reporting their usage correctly to the OS itself. I have had Facebook and a few other apps not show their usage at all during a full cycle. I have used a 3rd party monitoring tool and showed Facebook use 2.9 GB while the built in one didn't show Facebook at all. Often I have seen one app say 500MB while the 3rd party says 220MB as well. There's other threads about this and so far to date I never used the onboard one because it's not accurate enough as it should be and even Google says it isn't on more than one occasion on Google groups.
Having accurate control over your data consumption is very important. I keep tabs on all my devices all the time. As was mentioned before, make sure your billing cycle start date is correct on your phone. The billing cycle start date is different than your bill due date.
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