Did you try rebooting the phone
Hold the top power button in until you get a on screen switch to turn off - go ahead and slide to off.
Press the same power button in and hold until you see an Apple Logo - reboot underway.
Check phone call to see if it is fixed.
You have come to the right place, because help is our middle name! Let’s make sure that you can see who’s calling ASAP. When did this issue start? What make & model phone do you have? Weth, provided a nice troubleshooting step. Have you been able to power the phone completely off & then back on?
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