You'll need to post a bit more info if you want assistance from the Community Forum.
Was it ever working before?
Or are you just joining 48?
If you're just joining then you should review the New to 48 FAQs:
Did you successfully activate the SIM?
Is your phone unlocked for use on any network?
Are there any error messages when you log into your My48 account?
Have you tried reseating the SIM in case it's not inserted/seated correctly?
If the SIM is faulty then you'll probably need to try a replacement:
If you need to contact 48 support about this then see the links in my signature below.
