Does an AT&T iPhone 3/4/4s work with tmobile?

Ok, so here's the story. We don't want to pay a lot for phones so we're going to get the from amazon locked to AT&T. We're with tmobile, so can we use it with tmobile. And if we unlock it, will att unlock it for us or would we have to find someone else… Thank you

Yes, but you will have to pay a fee to AT&T to unlock it then you have to set up an account with T-Mobile and add your phone to it.

The AT&T iPhone 3G, 3GS, 4, 4S are all compatible with TMobile.AT&T won't unlock them for you because if I read correctly you ar with TMobile right now.AT&T only unlocks your phone if you are under service with them and call them as a customer to unlock your phone. If you're going to buy them from Amazon, you can try looking for already unlocked phones. If not do some research on getting them unlocked because you're gonna have to find someone or some company to do it for you. And to be completely honest with you, you should switch to Metro PCS from TMobile if the coverage is good in your area cause it's cheaper.

Hi no your iphone 3/4/4s locked to AT&T network provider won't accept t-mobile sim until you unlock it… You can unlock your iphone from your network provider AT&T they will sure unlock your iphone but they will take few days to unlock it.Instead of asking network provider you can easily unlock your iphone with the help of third party online providers like http://www.mobileunlocksolutions.com/apple/rs16wp8/ here they unlock your iphone using remote unlocking service within 1 to 2 working days for affordable cost…