I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
Currently using: Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)
Hey @C442 , just to add to the above in case these would be helpful at all: if you check the device guides here, see if it has your phone model. For example iPhone 11, if you click on that, then 'Specifications', then 'General', you can find the SIM card type there at least for the physical SIMs.