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Free Call Screen Lock gives you control over phone locking during or after calls. You can choose whether you want your phone to lock after dialing, picking up a call, ending a call or rejecting a call. You can also customize the interval of time between the action and locking the screen.
For this app to work, you must follow the steps in the app's main screen. After starting the service, it will run continuously, checking your phone's state every second. To stop this, simply press the notification.
If the service closes unexpectedly, try following step 2 in the app, as some phones have custom memory management services that close this app, even though its memory and CPU usage are not high.
Fixed phone manufacturer detection not working in some cases