If you mean that it has been suspended because you didn't buy a membership plan for 6+ months then you'll need to contact 48 support to see if they can reactivate it for you.
If it's been more than 13 months since you last bought a membership plan then you'll most likely have to start from scratch as a new user with a new SIM and number on 48.
If that's not the issue then you'll need to clarify what the issue is.
If you need to contact 48 support about this then see the links in my signature below.
