T-Mobile full-sized SIMs require some trimming but they do work in the iPad and will get you an EDGE (not 3G — different radios) data signal if you are so inclined.  You probably won’t find a deal as good as AT&T’s, however.  Instructions can be found here.

Bonus: If you jailbreak, you can send SMS’s from Tmobile  (video below!), where on AT&T, the functionality is disabled. via MuscleNerd

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