My daughter has the $15, 200 MB data plan. the last 2 months she has been going over. she is always on wifi at home. I went to ATT OLAM and have have noticed huge spikes of data, many in the middle of the night, but some during the day. Any way to figure out what is using so much data? For now, i've turned data off and wifi only until the billing cycle ends, but that's 12 days away. Any input appreciated.