I like to put my cell phone in the safe during cruises because I like to unplug and get away from the real world. Here are the specifics that I found to be true during my October and March cruises:
1. You can request a hard copy menu at any restaurant, including the specialty restaurants. If you can't remember your MDR table number, the person at the host stand will look it up for you.
2. You can do the muster drill without a phone. Just tell the person at your muster station that you don't have one and they'll check you off their list.
3. The daily activities are listed on your stateroom TV.
4. When I was cruising they had a virtual queue for getting off at ports (not sure if this is still ongoing), but I never bothered with it as I never wanted to be one of the first off the ship. Within an hour or so the virtual queue was no longer needed.
5. Once I did a ship excursion, and no app was needed for that.
6. You can drop in to talk to Guest Services in person or call them via your stateroom telephone 24/7.
7. You can make last-minute dining reservations for Palo and Remy via stateroom telephone.
8. You can stop by Guest Services to get a hard copy of your folio at any time.
9. When you get pictures taken, you tell them your stateroom number. You don't need your phone for that. You purchase pictures at the picture kiosks on deck 4.
If you want to book a placeholder cruise, currently you must do that through the app. As an other poster indicated, though, you can apparently borrow an iPad from
DCL for that purpose. (I haven't done that myself so I can only go from what the other poster said.)