My Sony Xperia Z ultra slim is saying unfortunately, the process com.android.phone has stopped, how can I fix this?

[AC Question]

my sony xperia z ultra slim is saying unfortunately, the process com.android.phone has stopped

It wont dissapere ive tryd the volume and holding down nd up nd still not working will a sony shop help??

 

[B. Diddy]

Re: my sony xperia z ultra slim is saying unfortunately, the process com.android.phone has stopped

Welcome to Android Central! Try booting into Safe Mode, which temporarily disables all 3rd party apps. https://support.t-mobile.com/docs/DOC-11856

If the problem disappears in Safe Mode, then something you installed is causing the problem. You may have to uninstall apps one by one until the problem disappears. If the problem persists in Safe Mode, then it's more likely to be a hardware or firmware problem.