Can’t send iMessages

• Turn off and restart iMessage and FaceTime

1. Go to Settings > Messages and turn off iMessage.
2. Go to Settings > FaceTime and turn off FaceTime.
3. Restart your device.
4. Turn iMessage and FaceTime back on. (Watch the GIF below)

• Still not activated after a day?

1. It might take up to 24 hours to activate iMessage and FaceTime. If the issue continues after 24 hours, follow these steps:
2. Make sure that your device has the latest version of iOS.
3. If you're using an iPhone, contact your carrier to make sure that you can receive SMS messages.
4. Contact Apple Support.

If you get an error when trying to activate iMessage or FaceTime ...

You may get better and prompt responses if you may kindly provide the iPhone Model that you have and the iOS version if it is known to you.