Now that I am using my Samsung phone exclusively, I find that the screen blacks out during calls. I cannot use the key pad or tell if I am still connected. I followed a suggestion to hold the power and home buttons down for 20 seconds but that did not help.
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It sounds like you have a problem with the proximity sensor. Do you have a screen saver or a case on the phone it could be interfering with the proximity sensor.
The proximity sensor detects when a user is holding the phone near their face during a call and turns off the display to prevent keypad presses and battery consumption from the display.
The proximity/light sensor should be located to the right of the earpiece.
You can try disabling it when in a call and see if it help but it will keep the screen on when you hold the phone to your ear.
Open the phone dialer
Tap Menu icon.
Tap Call settings.
Tap Turn off screen during calls to enable or disable.