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How to solve this issue 'unfortunately com.android.phone has stopped'
Settings > apps > phone > storage > clear data > restart the phone > check again
Hi @senthilkumar1, I am very sorry to hear about that. 
Did this behaviour start after something specific happened to the device, for example after a software update? Could you try to see if the same occurs while in safe mode?
Let me know how it went!
I does not know from when will this problem starts. But each time i restart the phone this message will appears and gone.I am not tried in safemode.
In that case could you first try to see if it occurs in safe mode as well? Let me know how it behaves there, it'll be a good way to see which direction we should steer the troubleshooting going forward.