Can i use a used iphone 4s to unlock on tmobile?

I was wondering if i could get a used at&t iphone 4s from a site like craigslist. I have tmobile and i was wondering if i could still use the at&t phone with tmobile instead of buying the $549 from apple. Can someone please help me?

Yes! T mobile sells micro sim cards, buy a used iPhone and put in their sim card. Excellent idea, I'm doing the same thing, but on straight talk.

There's a thing called a Turbo Chip for iphone 4 to make iphone works for other carrier. I tried and it works fine you can buy the turbo chips online like ebay or amazon for just between 5 to 10 dollars.

Yes you can definitely use an iPhone 4S with T-Mobile. But you need to unlock the mobile in prior from AT&T network. You can unlock an iPhone 4S safer and easier through remote unlocking method. You can get the remote unlocking for an iPhone 4S from http://www.unlocking4u.com/apple-iphone-4s/rs6wp9/ at affordable cost. This method of unlocking doesn't require a Jailbreak too.
Here are the steps for unlocking an iPhone 4S,
1. Wait for us to send you an email saying your phone has been activated or remotely unlocked.
2. Install the latest version of iTunes.
3. Make sure your Apple iPhone 4S phone software is updated to the latest version using the iTunes software.
4. Connect your Apple iPhone 4S to iTunes with a NOT ACCEPTED SIM card.
5. Wait until iTunes detects your Apple iPhone 4S.
6. Disconnect your Apple iPhone 4S and reconnect it after 10 seconds.
7. Your Apple iPhone 4S is now unlocked.

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