Many thanks arxcards and losfp for your prompt replies.
Mmmm, well that's put a spanner in the works for me. I'm trying to get that darn' Princess medallion app to work on my old iPhone6 but it just keeps closing down, so I thought I may be able to use my new iPad ... but without wifi at the port I won't be able to bring the info up to show at checkin.
Oh well, I'll enter our info on the website the old fashioned way and hope for the best. I presume I'll still be able to print boarding passes and luggage tags?
Gawd, who knows what will happen with this medallion thingie.