When making a phone call why does the screen go black on my Droid Max HD?

[AC Question]

when making phone call screen goes black on droid max HD

I have a droid Maxx HD 32 gig phone through Verizon Wireless on their new prepaid plan. When I go to make a phone call screen goes black. But phone call still goes through and can speak and here from the other party.but I can't put anybody on the speaker or I can't hidden numbers to send a message because the screen is black

 

[Almeuit]

Re: when making phone call screen goes black on droid max HD

I would use some canned air near the proximity sensor on the phone - it most likely has dust in there and it thinks it is near your face as soon as the call is initiated.