Disable screen turn-off during phone call I know this might be a possible duplicate question but I haven't found an answer yet.

phone>call settings>proximity sensor is not available in my version of android.

Is there another way to disable the screen turning off when i dial or receive a phone call?

Is there an app i can install that does it?

Regarding the duplicate question: This question is different because i'm targeting android 4.x and beyond and because I want to disable the proximity sensor completely, it's broken on this device but even if it did work, I would like to override it somehow, preferably without having to install an app with ads etc.
Proximity sensors allow the screen to turn off when close to the ear during a call. It should automatically come back when it's uncovered i.e. when it's not close to the ear.

That said this app seems to promise that functionality -> Smart Screen On Off