FaceTime

• Restart the device. That's it.
• Still not solved --> Force restart iPhone - Apple Support

Hunter2407 Said:

"FaceTime : I was on FaceTime and I got a text message and I clicked on their name to reply back cause I click custom and then when I went back to the FaceTime call, the messages wouldn’t close even when they hung up and I can’t swipe out or power my phone off"

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Troubleshooting a Frozen iPhone:

Try the Tips at these Apple Support Links:

• If your iPhone is Stuck on the Apple Logo - Apple Support

• If the Screen isn’t Working on your iPhone or iPad - Apple Support

• If your iPhone Won't Turn On or is Frozen - Apple Support

• If you Need More Help - iPhone - Apple Support