You'll need to post a bit more info if you want help here.
Was it working before?
Or are you only joining 48 anew?
What exactly is not working?
What make and model of phone?
Is it unlocked for use on any network?
Did you activate the SIM correctly?
If you do a manual scan for networks can you see and connect to 48?
I am not a 48 employee - if you need to contact 48 support then please click here
- if the Chat Now option does not appear on that page then keep trying until it does.