7 ROOM KABOOM!
Have you ever been in a “Oh, no! I’ve forgotten my room number!” situation? And lost the hotel swipe key cardholder that had your room number written on it? You can always trudge back to the reception and go through the (often slightly embarrassing) rigmarole of asking for it. But why not make it as easy as pie by snapping a picture of your room door/number as your enter/exit it the first time. Now, if the digits of your temporary abode slips your memory, you merely need to take a peek at the photo.