Can someone help me to unfreeze my android phone?

I don't know where else to ask. I did ask Google, but no further steps were provided and it didn't solve my problem.

Earlier today, my phone had started to act up. When my mother was trying to use my phone to call someone, she couldn't pull up the dial pad during the call. I tried hanging up the call, but my phone seemed frozen. The only thing that wasn't frozen, was the number of seconds and minutes on the call. I had restart my phone, trying to see if it'll act right, but it didn't. So I restarted my phone two more times and it's still frozen. The only thing that seems to be working, is the time.

Can someone help me to unfreeze my android phone?
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