A good friend is taking his wife to Europe in a month or so. He's not on Flyertalk but he is a Verizon customer. They're flying in to London and then to Rome, where they will do a cruise for a couple of weeks that eventually ends up somewhere in Spain. The return flight is from London as well.
IME renting a MiFi device can be good, but I've never been to Europe, so I can't help him. Would it be possible to rent a MiFi device, say at LHR, which would work throughout their trip? Or would they be better off paying Verizon for a travelpass?