My iphone's phone app is frozen?

I have an iphone 4s and since this morning the phone app is frozen. It's not going up or down or letting me call anyone or add a new contact. I have tried restarting but it worked for a few seconds and then went back to being frozen.

Mine did the same exact thing I wasn't even able to make calls without it freezing that's when I drove my *** down to Verizon and got a Samsung galaxy and never had that issue again.

I never did find out what it was but I just use it as a MP3 player now

It works just fine as a MP3 player maybe you need to shut it off for 24 hours and see if that helps it cool down maybe
Maybe the CPUs too high or it's getting too hot

Try holding down the home button and closing all your open apps
A lot of text messages can slow down your phone
Your call log can slow down your phone if it's built-up
Too many pictures or screenshots, maybe save them to a computer
Delete any apps that you don't use

If all those don't work maybe try to reset your phone completely.

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