Many AT&T customers picked up a new HTC One X in hopes that someday HTC and AT&T would unlock the device's bootloader. Time went by and the situation hadn’t changed and HTC even went as far as citing "restrictions" (see AT&T) that prevent them from unlocking the One X. As you can imagine people weren’t pleased with this situation and ultimately the Android dev community geared up for work. After a few weeks of hacking one crafty XDA member reached the triumphant goal before anyone else. Thanks to grankin01 we now have a round-about way of unlocking the "restrictionâ€...
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AT&T HTC One X Bootloader Unlocked!
Stacy Bruce - talkandroid.com