An Update.
The BB data plans definitely work technically with the G1, however, TMobile are monitoring the device types and turning off service when they discover a non RIM device on a BB data plan.
Case in point.
I took my TMobile BB sim card out of my Blackberry and put it into my activated TMobile G1. The G1 worked great, full browsing etc, for about 4 hours!
Suddenly, I was getting a message about an incompatible device for the data plan and an invitation to upgrade my data plan!
I put the SIM card back in my Blackberry.
I have since unlocked the G1 and put in a ATT 'Pay as You go' sim card.
G1 works correctly. I have enabled the WIFI on the G1 so even though it has a ATT Pay as you go sim card, any data browsing happens over the WIFI and is not charged to the SIM card.
Holy resurrection this thread is old. Wow!
It's not who I am underneath, but what I do that defines me
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