I always get an error when sending text messages. However, other person does get the messages.
Solved
my text messages always comes back as not sent
Best answer by andewhite
Maybe Apple can explain why the phone in Settings > Apps > Phone can’t be changed,
As per the community article, a network reset can sometimes fix this issue - your iOS user guide explains all the reset procedures for your iPhone.
Reply
Rich Text Editor, editor1
Editor toolbars
Press ALT 0 for help
Log in to the iD Community.
Not a member yet? Create an account
Please note: 'Log in with Facebook' is no longer available. If you used this service, you'll need to create a password to keep using the iD Community. Click 'Forgot Password?' to get started.
Please enter your email address. If it matches our records, we'll send you a password reset link.
Need help? Email CommunitySupport@idmobile.co.uk with your iD Community username.