The respons about the iphone forum I think meant that as you have an iphone the dedicated Iphone forum may be a better place to post.
iPhone 11 Pro 256gb on unlimited data iPad Pro 12.9” 2020 256gb refresh o2 family discount Apple Watch series 4 My first mobile was in 1995 a CM-R111 from sony on Cellnet. Wincanton South Somerset (Full 4g 3G 2g indoor coverage) Remember we are all customers here not customer services
I just spoke to some guy at O2 who says that there may not always be a 3G symbol on my phone. I asked him if I needed to have 3G activated on my account but he said no as it was not an account specific thing but a handset thing.