an hour ago
8m ago - last edited 7m ago
What exactly do you mean by "delete and rest"?
Where does it say that?
Do you have an active membership plan in order to be able to use outgoing services?
Are incoming and outgoing calls working for you?
Can you receive texts?
Is mobile data working for you?
The 48 mobile data APN settings are explained here:
But they have nothing to do with SMS messages.
What happens when you try to send an SMS?
Any error messages?
In some cases iPhone messages don't send because iMessage needs to go through the stupid Apple activation process.
This involves the iPhone silently sending a text message to a UK activation server and this will fail silently if it can't be sent.
This will fail if you don't have an active membership plan and cash credit on your account to pay for the international text message.
So if all else fails maybe try putting €1 cash credit on your account, make sure that you have an active membership plan, switch the iPhone off and on again, wait a little while and see if things work thereafter.
If you need to contact 48 support about this then see the links in my signature below.