Brand new iPhone on wifi shows 0 bytes of data used but Tmobile website data used keeps going up


    I have a brand new iPhone (only default apps installed) and new T-mobile prepaid plan.  The phone has been on my wifi its entire life of a few days and shows 0 bytes of data used in cellular settings.  Every time I log on to my.tmobile website the data used goes up (only when the phone is on).  Why?

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