Where is it saying that?
What is the verbatim message?
When was it working ok last?
When did you last buy a membership plan?
If it was more than 6 months ago then your SIM will have been automatically suspended.
7.2 In addition to the circumstances set out in Section 7.1 above, we may suspend (i.e. bar), restrict or end the provision of the 48 Services (in total or in part) if you choose not to purchase top up credit or make a chargeable use in respect of your Account for a period of 6 months
If you need to contact 48 support about this then see the links in my signature below.
