Will an at&t iPhone work for Tmobile?

So I have Tmobile and they recently started carrying iPhones, but I'd rather not spend $700 on one so I was going to buy a used 4s that was with at&t, will it work?

Nope, t mobile needs a sim card.

If you want to use T-mobile sim in AT&T Iphone 4S, you need to unlock it. Without unlocking it from AT&T network lock, you can't use with other network sim card like T-mobile.Visit the site http://www.simpleunlocking.com/apple-iphone/rs16wp9/ get remote unlock service and get free unlocking instructions from http://www.mobileunlockguide.com/apple-iphone and unlock it step by step.

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