Ohhh you're talking about frequency...
Yes, the iPad uses the following frequencies:
# UMTS/HSDPA (850, 1900, 2100 MHz)
# GSM/EDGE (850, 900, 1800, 1900 MHz)
T-Mobile initially rolled out their HSDPA network with a 1700 frequency, but they've (apparently) upgraded it to a 1700/2100 network since. Which means that Micro Sim support is still the only thing stopping them from offering iPad data. There are even videos on YouTube of people who have shaved down their normal T-Mobile sim card to fit in the micro slot on the iPad, and are able to get data service that way.
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