A:AnswerCorrect . You will have to switch to an esim & it’s really easy to set up through your carrier . Just double check that your phone carrier offers esim.
A:AnswerYou are able t0 but do not delete your iPhone 11 before accessing apps like google photos, Authenticator, outlook, you’ll need your iPhone 11 to verify with on your new 15
A:AnswerYou can just walk out after payment unless you want to buy accessories for the phone like i did other than that your fine to just purchase and leave as please