Unlocked iPhone 4s for T mobile?

Do they work good when unlocked and used on Tmobile service… Or will i sacrifice internet performance and such compared to using a tmobile phone?

You will only get edge 2g, no 3g, 4g with an iphone on tmobile

How 3G Frequency Compatibility Works / Why Your Unlocked Phone Doesn't Get 3G

http://theunlockr.com/2009/10/07/how-3g-frequency-compatibility-works-why-your-unlocked-phone-doesnt-get-3g/

There will be a sacrifice. If you need to unlock the att iphone you can do so here http://gsmunlocklabs.com/unlock-iphone/

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