My family has been using multiple Iphones (3G, 4 and 4S) with Tmobile for months now. We are in the middle TN area north of Nashville and have always had just Edge network connections. Recently, our phones have started having occassions of 3G and 4G ATT Network showing up and whenever we try accessing the internet at these times, we get a notification popup that states we do not have a data plan. After awhile, the ATT network disappears and TMobile comes back up with E connection. The freqency of this seems to be increasing. Voice calling still works during this time. Does this mean we're getting network upgrades or is there something else going on?
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