If your Samsung Gravity T (T669) is stuck on the PIN lock screen and you do not have the code to unlock, you can try a master unlock code... 73683139 to override and then go to settings and turn off lock feature. When you reactivate lock feature it will prompt you to select a new PIN.
If your phone requires the T-mobile PUK code to unlock (you get a message that says call support PIN is locked) the PUK unlock for this phone is **05*22998214*0000*0000#. This will unlock device and reset PIN to 0000.
Enjoy.
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