I can't find the 5g add on for prepay anywhere on the three website
@Dob Hello there, by any chance are you on one of our newer suite of Prepay plans? These allow for 5G add-ons. To apply this to your account you'll need to go to your My3 dashboard.
Have a look at our Help Blog for more info 👇
Re: All About: 5G Plans & Add-Ons