Sony C3 dual

[Mahi007]

It's new phone & 3 days old, while I am in call screen goes blank and When I press power button it still does not come to life, but call will be on, I can conference the call or reduce volume or put call on speaker as the screen has gone blank, it comes back to life only after call gets over. Its very basic function, this needs solution else it's annoying

[Samuel1]

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?

If the issue should still remain I think that this needs to be examined and fixed at a repair center. For more information about how to submit your phone for repair and where, contact your local support team.

[Thommo]

Is your phone in a case or does it have a screen protector on that could be blocking the proximity sensor