Screen locks when I try to call someone

Hello.  Can someone please help me.  When I dialed a number today as soon as I presses the call button my screen locked and when I tried to unlock it it just went on lock again the touchpad was not working nothing

Does the same thing happen if you restart the phone? If it does, I suggest that you try to repair the phone software using PC Companion..
Before repairing your device you may want to backup your information first. Check out this topic for more information on how to.
How to backup?

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