Why my c3 screen goes dark on call

[emmanuel85]

Please I really need help on how to stop my C3 screen from going dark or sleep each time I try to make a call and it does come up till after the call no matter what I try during the call.

[Qatrium]

Hello @emmanuel85 and welcome to the community!

If you have a screen protector or a phone case installed, make sure it's not covering the proximity sensor. It's marked by number (1) in the following diagram:

Xperia C3 - Top

Also, make sure the same sensor is clean and free from dust/debris/fingerprints, use a clean soft tissue to remove any.