|I thought I had heard about all the scams, but this was a new one for me:
You arrive at your hotel and check in at the front desk. Typically when checking in, you give the front desk your credit card (for any charges to your room).
You go to your room and settle in. All is good.
The hotel receives a call and the caller asks for (as an example) room 620 - which happens to be your room.