Update your device to the latest version of iOS or iPadOS.Go to Settings > General > Date & Time and turn on Set Automatically.Make sure that you have the correct phone number or email address listed.If you don't see the FaceTime setting, make sure that Camera and FaceTime aren't off in Settings > Screen Time > Content & Privacy Restrictions > Allowed Apps.Learn what to do if you can't activate FaceTime. It can be frustrating when you receive these codes, because you know there’s a problem, but you don’t know what actually went wrong. Did You Receive An Error Code Sometimes, you’ll receive an error code from Zoom when it stops working on your Mac. If you see 'Waiting for Activation,' turn FaceTime off and then on again. Click Join A Meeting and enter the Meeting ID or Personal Link Name to join the Zoom meeting.Go to Settings > FaceTime and make sure that FaceTime is on.If you're using an iPad, you might see Settings > Cellular Data. Go to Settings and tap Cellular or tap Mobile Data, then turn on FaceTime. If you're trying to use FaceTime over cellular, make sure that Use Cellular Data is on for FaceTime.Learn more if you're using router, firewall, or security software that restricts internet access. Make sure that your device has a Wi-Fi connection to the internet or a cellular-data connection.
If none of the above reasons apply to you, and you still can't make or receive FaceTime calls, follow these steps: