Restart Your iPhone

This should be your go-to troubleshooting tip when you can’t fix your iPhone. Yes, it might sound like a cliché at this point, but turning your iPhone off and back on really does work sometimes — especially with issues like this one.

If you can’t make phone calls, try restarting your iPhone and see if that does the trick. To restart an iPhone with Face ID, simply press and hold the side button and one of the volume buttons until you feel a vibration. On an iPhone with Touch ID, all you need to do is press and hold the side button until you feel a vibration.

Next, move the power-off slider to the right, and your iPhone will shut off. Wait around 30 seconds, and then press and hold the side button again until you see the Apple logo on your screen. Give it a few moments to turn itself on and try making a phone call again.