Check the basics
Didn't fix it
- Make sure that you’re connected to a cellular data or Wi-Fi network.
- Make sure that your device has the latest version of iOS.
- Make sure that your time zone is set correctly. In the Settings app, tap General. Then tap Date & Time.
- If you're using an iPhone, you need SMS messaging to activate your phone number with iMessage and FaceTime. Depending on your carrier, you might be charged for this SMS.
Apple: If you can’t turn on or sign in to iMessage or FaceTime on your iPhone ↗