Will an iphone 4 or 4s work on tmobile?

I want to get a iphone but can't afford the 5, if I get a 4 or 4s which will should I get? Will everything work on them? Will they run 2g, 3g, or 4g. Is it worth getting?

Between the 4 & 4S, of course the 4S.

Yes everything will work except 3G (possibly). T-Mobile does not/did not use the same frequencies for them as the iPhone supported though they are changing that slowly but surely, more so since they are now also an official iPhone carrier. Neither of those iPhones run 4G.

Also make note that the 5S & 5C are expected soon, so you may want to wait & see what they are like or how they would affect the prices of the 4 & 4S.

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