Nokia 700 display issues??

I am a new guy here since I am looking for some suggestions on what could be wrong with my phone.

I have a Nokia 700 and when I am receiving a phone call it doesn't display the caller id. Also when I am listening to voice mails and I got to delete a voice mail the screen will not display anything.

I did just recently change out the digitizer and screen to see if this would fix the issue but no luck there. Thanks ahead of time for any recommendations before hand.

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So when the phone rings nothing displays at all or it just doesn't display a name for the number?

Sir nothing displays at all when I am receiving a call.

Software problems

Display problem !! This the NOKIA brand & it's unthinkable ! Is Nokia really gonna diminish ?