When was it working ok for you last?
Do you mean that mobile data has stopped working altogether or you are only getting 4G/LTE now?
Are calls and texts working?
Do you still have a connection to the 48 network - i.e. signal bars?
Do you have an active €12.99 membership plan?
Are your APN settings still correct?
Did anything change on your phone recently?
E.g. software update, settings changes, factory reset/restore, new phone handset, returned from roaming abroad, etc.?
If you need to contact 48 support about this then see the links in my signature below.
