I have AT&T iPhone11 (unlocked) and go to Europe several times a year. My thought was to keep the physical AT&T SIM Card in the phone but get an esim card depending on where I'm travelling. Does this make sense? But I can't figure out how to get one online before I go -- maybe it's not possible? I want esim data with some limited voice. EE supposedly has that for UK (according to Apple support esim support page) but I can't figure out how to get it on their website. Also tried Orange and Vodaphone but similarly confusing. My plan seems simple (1) go to carrier website; (2) sign up for esim (3) pay (4) download QR code and set up esim. Am I missing something obvious?