jkOnTheRun notes that lots of people are experiencing data connection problems with T-Mobile and theorizes that the possible reason is that T-Mobile has finally gotten wise to the "T-Zones Loophole", which allows you to get access to the full internet while only paying for the supposedly WAP-ony T-Zones service. A photo of an internal T-Mobile document backs this up.
It's intermittent (I haven't experienced it yet) and not limited to T-Zones users. Have you had any hassles lately with data plans?
Read: jkOnTheRun: T-Mobile data plans suddenly stop working
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