When was it working ok last?
Did anything change on the phone in the meantime?
E.g. software update, settings changes, factory reset/restore, new handset, returned from roaming abroad, etc.?
What sort of download/upload speeds are you getting?
Are you on 4G or 5G?
Are you sure that your APN settings are configured correctly?
If you're on Android then see here:
Do you know anybody else locally on 48?
If so what is their experience?
If you need to contact 48 support about this then see the links in my signature below.
