iMessage does not connect
Error on adding the phone number to allow for sms texting
iPhone 6, iOS 12
Question marked as
Top-ranking reply
Set up imessage and facetime after change of number.
Settings, Messages, Turn off iMessage
Settings, Face Time, Turn off Face Time
Restart the phone.
Settings, Messages, Turn on iMessage, SMS, MMS
Settings, Messages, send & Receive, Start new conversations from, select your Apple ID which should now be there.
Settings, Face Time, Turn on Face Time
If you still can't send or receive messages on your iPhone, iPad, or iPod touch read this:
If you can't send or receive messages on your iPhone or iPad - Apple Support
If you have activation problems see here
See If you can't turn on or sign in to iMessage or FaceTime – Apple Support (UK)