Hi ​@clivec92 

I do apologise that you are facing coverage and text issues. Kindly check if the number is correct under settings. 

For iPhone:

1. Please go to Settings> Phone> My Number.
2. Please change it to the number you wish to keep. It might not allow to change or save immediately.
3.  If you are still unable to save kindly open the Settings app. Tap General. Scroll down to the bottom of the list. Tap Reset. The "Reset" option is at the bottom of the Settings menu. ... Tap Reset Network Settings. Enter your passcode if prompted, then tap Reset Network Settings to confirm your choice. This will help.

For android:

Settings > About Phone or About Device > Status > My phone number.  Some Android phones will have SIM or SIM card status listed within Status.  This is how you will be able to find the number you are using on your phone and sim. if using Message App, Change the phone number associated with the Messages app:  Open the Messages app.  Tap More then Settings then Advanced Select Phone number then edit the number to the correct phone number associated with your SIM card.  Tap OK.    If still have issue, remove the SIM and reboot the device.  Then re-insert the SIM and check if its updated the correct port number in Phone settings.    Still have the same issue after rebooting then advise try the SIM once in different device and see while sending text does it shows temporary number or port number.

-Owethu

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Hwllo thank you for your reply, my correct number is showing already ? 
 

thanks

Hi ​@clivec92 

Thank you for getting in touch with us Please use the following link to check the coverage in your area:
https://www.idmobile.co.uk/help-and-advice/coverage
or try to reinsert your SIM or try your SIM in another phone. This will determine whether the issue is with the handset or with the SIM card itself. Id the issue persists please send us a private message so that we can have a look into your account.

Thank you,

Zandile