I have a total of 6 phones on my account. I have been struggling with one of my daughters I thought was using way more data than anyone else. I finally read where the usage is calculated for a 3 hour period then recorded on the usage log. I now have this same usage showing up on two other phones on my account. I have went over my 20GB limit about 3 times. The phones are linked to WIFI during the time data usage is being billed and a large part of it is occurring at night when everyone is sleeping.
How is this possible since the phones are linked to wifi and are not in actual use. Should I be concerned about this being due to a hack in the phones or is this a way ATT updates. Funny thing is it's been only one number until this month.