What exactly do you mean by "slow"?
What sort of speeds are you getting using a Speedtest?
Are your APN settings still configured correctly?
Are you on 4G or 5G?
Did anything change on the phone since the issue started?
E.g. software update, settings changes, factory reset/restore, new phone handset, returned from roaming abroad, etc.?
Are calls and texts working ok?
If you need to contact 48 support about this then see the links in my signature below.
