Unable to activate iMessage
I changed my number now iMessage and FaceTime is giving me an error message
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There are always a number of steps that 'we' have to perform after changing to a new phone number.
Such as informing all your contacts.
The data linked to your Apple ID must also match a number of things, such as your trusted phone number, see :
Sign in to your Apple ID account page and edit / update your Apple ID details.
-> edit or check your trusted phone number.
Check whether your own details at Contacts are still correct.
Check whether your 'new' phone number is linked correct -> Add or remove your phone number in Messages or FaceTime
Add or remove your phone number in Messages or FaceTime – Apple Support (UK)