FaceTime and iMessage may be stuck on “Waiting for activation” screens, but you can fix this problem by restarting your iPhone or resetting your Apple ID. If this does not work, try contacting your carrier to see if they have fixed the problem. If not, simply wait for a day or two until the error message goes away. After this, you can use iMessage and FaceTime for free – provided you have a stable internet connection.
Error messages can have various causes. You can look for an error code that indicates the type of error. For instance, the message may say that the Software Licensing Service (SLS) reported a license tampering, license evaluation failure, or system file mismatch. You can also check the manufacturer’s support website for more information about error codes. These codes can give you a hint on the reason for the error message.