Discrepancy in data usage between phone and T-Mobile app

Question

I am currently travelling abroad and did reset my data tracking in my iPhone the day before I left the USA. The phone shows I have used 660 MB of data since the reset. However, T-Mobile already shows 1.6 GB of international data used in less than a week, almost 3x as much and much more than I would typically use in the US. How can that discrepancy of a factor of 3 be? Shouldn't the phone be more accurate?

syaoran · Answer

Phones are never accurate due to the aystem services that aren't logged that do various things in the background.&nbsp; Maintaining your iMessage connection, location services like find my phone whether you use the feature or not, maintaining your VoLTE/VoNR connection to the network, maintaining your data connection to the tower for best performance, etc.&nbsp;

drjochen · Answer

The phone shows almost 400 MB in system services. I never had such a discrepancy (factor of 3!) while in the US. The phone and the data listed by T-Mobile are always within 10%.

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