Hi Dalyer, Thank you for your reply. I’ve contacted Apple technical support and they said that it’s because the international text messages might not be allowed with 48 and I need to try and resolve the issue here... is that the case? All the troubleshooting didn’t work. Thank you!
You need cash credit on your account to send international texts. 25c each. The stupid Apple iMessage/iPhone/Facetime activation processes need to send a UK SMS which will not go if you don't have cash credit and the stupid Apple process doesn't make that clear. Add I said there are lots of other posts/threads dealing with this issue.
Hope this helps.
I am not a 48 employee so if you need to contact 48 support then use option 3 or the chat facility here.