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I've used http://unlockiphonevip.com before and it worked for my iPhone 4s...
I would instead download jailbreakiphone4buzz.com for iOS 7.0 and 6.1.4 firmware versions, even updated ones
Learning how to unlock iphone 5 on updated firmware can be a difficult process?
If your iPhone 4s is jailbreaked, then use ultrasn0w fixer from jailbreakiphone4s.com...
Use the popular evasi0n jailbreak which works on all iPhone 4s firmware versions including iOS 7.
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I wouldn't unlock iPhone 4s until you first unlock it from unlockiphone4s.com. Even though he did it safely!
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I would recommend using unlockiphone4sbuzz.com software as I did to unlock iphone 4s on my own.
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I've used http://howtounlockiphone.com before and it worked for my iPhone 3gs!.