If you are trying to activate a new Apple device such as iPhone, iPad or MacBook then possibly you might see a message saying Imessage Activation Unsuccessful error. In this case, you can’t use iMessage or Facetime. Don’t worry, Here we have shared some quick fixes, whether you own an older iPhone or a newer one.
1. Restart Your iPhone
2. Restart iMessage and FaceTime
3. Enable iMessages to be sent and received with your Apple ID
4. Reset Network Settings
5. Check Your Time Zone Settings
6. Check Your Cellular or Wi-Fi Connection
7. Check Apple’s Server Status