Iphone Unlock straight talk?

Ok so i have an iPhone 3gs running ios6 i want to unlock it so i can use straight talk i have an at&t sim card because it used to run at&t but it has no service right now how do i unlock it without jailbreak

Added (1). I no it works on at&t but i would like to get it unlocked anyway

Cyberduck

if that fails I guess you'll have to jailbreak

You don't need to unlock it.att iphones work on straight talk.

Hi, You can unlock an iPhone 3GS locked to AT&T network safer and easier using remote unlocking service. This method of unlocking is safe, simple, affordable and quick. You can get the remote unlocking for an iPhone 3GS from http://www.simpleunlocking.com/apple-iphone-3gs/rs16wp9/ at low cost with easy instructions on unlocking process.

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