Just get an eSIM from www.eSIMs.aiWell my thinking was that swapping my main SIM to an eSIM would make it easier to pop a physical PAYG SIM card into the phone when abroad in countries where roaming is extortionate, keeping my main line active too.
Which might have worked well if the eSIM hadn't disabled 5G and WiFi calling. No easy way to tell whether it was the new iPhone or the eSIM which was faulty either, which would have been easy to diagnose with physical SIM cards.
I also still have the physical SIM 😏