I'm assuming when you say 5G 4G you are referring to data on your handset, or are you only getting a 3G signal
If the latter check
Guide: How can I sort out my network issues?
Was this a new SIM with the phone?
If not call in at an O2 store with Photo ID and get it swapped
This is not O2 and we are all customers here similar to yourself and cannot answer account type queries.
