If you are using an iPhone it may be worth trying the below:
1) Turn off iMessage (Settings > Messages) 2) Restart your phone (by pressing and holding the on/off button) 3) Tap Settings > Phone > My Number and confirm that it is correct. 4) If it is not correct, please enter the correct number 5) Turn iMessage back to On (Settings > Messages) 6) Finally, go to Settings > Messages > Send & Receive and see if the correct number is displayed under “Start new conversations from:”.
If you are using an Android, please try the below:
1) Open Messages, go to Settings (top right, Message Settings), open "Chat Features" or "RCS Chats", verify if this is the correct number or not.
2) If it shows the incorrect one, then head to: https://messages.google.com/disable-chat and you should be able to unregister the number. Once done, turn off the Chat Features/RCS and the phone. Wait a few minutes and turn the device back on and re-enable Chat Features/RCS it should let you re-register/update to the correct number. Alternatively, you can turn Chat Features/RCS off and test SMS after this.
I am having the same problem. I have tried all your steps above on iPhone and still experiencing the same issue. I have contacted Apple and they could not help - they advised speaking to you
Sorry to hear this, it may be worth then trying a replacement SIM card, these can be picked up from any Currys store and activated here.
Alternatively we can assist in having one delivered, we’ll be able to get in contact with you to assist here, or for a quicker service, we’d recommend using the Live Chat, Facebook or Twitter.