How to unlock my iPhone 4 for free without calling AT&T?

No service phone

IT'S not free but http://attiphoneunlocker.com/ can unlock your AT&T iphone for $24.95
You tell us your IMEI, and what model iPhone you have. Having made payment, we then mark your IMEI as unlocked within Apple's IMEI database - once this is done we send you an email confirming this. You then simply connect your iPhone to iTunes in order to complete the unlock. No stress, no hassle, Your unlock is guaranteed and is also permanent, meaning you can safely update your handset and sync with iTunes without ever worrying about it re-locking.
There's a possibility the code will be returned as NOT FOUND and its not in our control. If that happens you will be refunded.
http://attiphoneunlocker.com/

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