t-mobile shadow locked

I have T-Mobile Shadow. I usually put Device Lock last night I talked on phone and set it on a side and after that I tried to call some one and i could not unlocked it none of the button was working. sometime I can type my password but after that buttons stop working.
Can anyone help me out here.

Thank you verymuch

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You can try removing the battery and try it again. The system may have encountered a glitch and just needs to be restarted.

also, you can try adjusting the sim card or removing any extra storage cards or whatnot, sometimes they can get small corruptions and cause the whole phone to react

This is actually pretty common as well if you don't have a case or holder, and you keep the phone in your pocket. The moisture from your body actually seeps into the phone a lot more than most people realize. It can very slightly corode the connections on your keyboard.
It really is probably just a simple restart that is needed in your case.