Did you follow the porting instructions?
Did you get any error messages in doing so?
What number is shown on your account?
The one that you tried to port or some other one?
Do you have an active membership?
You need one to be able to use services.
Did you configure your APN settings?
If you do a manual search for networks can you see and connect to 48?
If you need to contact 48 support about this then see the link in my signature below or email them at firstname.lastname@example.org