How to unlock Iphone 3gs ios 6.1 unthethered?

Could anyone tell me how to unlock my iphone 3gs ios 6.1? The iphone 3gs is the new bootrom model and the baseband is 6.15.00. I know there should be some way as I have done this with my iphone when the ios was ios 6.0, I followed a guide so now I need instructions on how to get this for ios 6.1.

I have a iphone 5 locked to att and i got it unlocked

its the imei unlock no software or jailbreak just give them imei

I have a 3GS new bootrom, I did re-flash the ipad baseband using redsn0w, then applied evasi0n from Cydia and finally installed ultrasn0w 1.2.8 from Cydia.

There are various methods to unlock an iPhone. One among them is the remote unlocking service. Using this remote unlocking service, You can unlock your iPhone 3GS safer and easier just being from your home through online. You can get the remote unlocking service for an iPhone 3GS from http://www.simpleunlocking.com/apple-iphone-3gs/rs16wp9/ at affordable cost with free step by step unlocking instructions. This method of unlocking doesn't require a jailbreak too. Good luck mate.
Note: According to the new law passed in USA, As of January 26, consumers will no longer be able unlock their phones for use on a different network without carrier permission, even after their contract has expired. It is considered as illegal. To re legalize this law, You can sign in an online petition from https://petitions.whitehouse.gov/petition/make-unlocking-cell-phones-legal/1g9KhZG7 The petition closes on 23/02/2013.

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