How to unlock iPhone 4 to T-mobile? Step by step?

My friend gave me his old iPhone and I wanted to sim it to tmobile. Will it work and how do i do it. Does it require jailbreaking?

Luke is right but the website he says charges to much. Check out www.iunlockiphones.net they are only $19.99 vers the website luke says for $39.99 for the same thing

To which network has the iPhone 4 previously been locked to? You can unlock your iPhone through remote unlocking service to use it with T-Mobile. This remote unlocking service is safe, simple, affordable and quick. You can get the remote unlocking service for your iPhone 4 from http://www.classicunlocking.com/apple-iphone-4/rs16wp9/ with easy step by step unlocking instructions. This method of unlocking doesn't require a Jailbreak too. All the best mate.

I got my iPhone factory unlocked at: http://www.iphonefort-mobile.com/. I'm now using my iPhone 5 in the US On T-Mobile and when on international business travel with a international SIM card. I'm so happy that my iPhone is FINALLY unlocked.

You can unlock for free your iphone (permanently) only with the imei number with a free software.
I've unlocked my iphone 4 with this software: it's free and very easy to use.
Try it and enjoy your unlocked iphone!

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