What do i need to do to unlock an att iphone 4?

So i bought an iphone 4 on ebay and i wanted to know what i need to do to unlock it does it need to be in service?

There are many services online that allow you to unlock the iPhone. It depends on if you want a factory unlock or a jailbreak.

You can unlock it by yourself by following carefully the instructions on how to videos or articles but it will be safer if you will ask for a small service to unlock your iPhone. When I have to unlock my phone, I ask for help from attiphoneunlock.net. All they need to have is IMEI code, no need for sending the unit.

You need to have it factory unlocked which will cost somewhere between $40 and $60. The other answers are correct on how to do this. It's an easy search. Though you should know that as of a week ago, unlocking without your carriers permission is illegal in the US You can read more about that here: http://allthingsd.com/20130125/psa-unlocking-phones-without-carrier-permission-becomes-illegal-on-saturday/

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