It turned out that it was not a T-Mobile problem but my iPhone setting problem.To avoid those unnecessary internet access from iPhone, you should do:Settings->Cellular->Cellular Data Options->Data Mode->Low Data Mode.Default setting of the data mode, “standard” allows the IPhone to access the celluar network to do some kind of bookkeeping functions.”Low data mode” blocks it.
I have the same problem.I called t-mobile support but no one could answer during months long weekly conversations.Even more, I also see a big discrepancy in data usage reports in t-mobile app in my iphone.“Usage->Data” and “Usage->Check usage details” report different usages.“Check usage details” reports a lot more data usage along with a lot of suspicious internet access activities even I put my phone under WiFi network.It appears that iPhone’s “Settings->cellular usage” matches with the t-mobile apps’ “Usage->Data”.It affects my old grand fathered kickback rebate.
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