Hi @Mikey68 what regional varient do you have? If you have a Global version or Indiab version, you would not have enough band connect well to the LTE networks Only the Taiwan or US/Brazil version will work well
Your phone 8n all version should have the full compatible bands on 3G
Try to lock your network type to 3G only and the data should work
This is all very confusing. Turn off all the radios except cell. Wifi off, bluetooth off, nfc off (if present), location off, mobile data off. Even force close any fm radio app. Can you call and text?
Turn on mobile data. Can you get to a website?
Turn off mobile data and turn on wifi and connect to your home internet assuming you have it. Can you get to a website?
Can you set your Preferred network type 3G or LTE or at least both.