Did you activate the replacement SIM?
What exactly is happening?
What messages are you getting on the phone?
Do you have a connection to the 48 network - i.e. signal bars?
If not then can you do a manual scan for networks and connect to 48?
Is anything working?
Calls, texts, mobile data?
What make and model is the phone?
If you need to contact 48 support about this then see the links in my signature below.
