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No. T-Mobile's 3G uses different bands and won't ever me compatible until Apple releases an iPhone which features those bands, which likely will never happen. You can however use T-Mobile's EDGE.
 
Well, Technically speaking, it is possible.


Open up your iPhone, take out the network chip, put in a compatible T-Mobile 3G chip.
Then, you have to make drivers for the network to work on the iPhone.
 
Well, Technically speaking, it is possible.


Open up your iPhone, take out the network chip, put in a compatible T-Mobile 3G chip.
Then, you have to make drivers for the network to work on the iPhone.

has anyone done it?
 
has anyone done it?

No.

Also, you'd have to replace more than just the baseband chip.

Let's put it this way: you're not going to do this. Even if there was a documented procedure for doing it, you wouldn't.

If you're on T-Mobile in the US and you have an iPhone 3G, EDGE and GPRS are the only forms of mobile data you're gonna get. Sorry.
 
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