FaceTime screen
when I try to FaceTime or call from mobile I get a blank screen and I can’t accept incoming calls and outgoing calls. I would have to call people myself.
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Go to Settings and tap Cellular or tap Mobile Data, then turn on FaceTime. If you're using an iPad, you might see Settings > Cellular Data. Go to Settings > FaceTime and make sure that FaceTime is on. If you see "Waiting for Activation," turn FaceTime off and then on again.
If you can't make a FaceTime call on your iPhone, iPad, or ...