This question already has an answer here:
I already have tourist visa to Germany. I stated I will be staying in a hotel, but I am PLANNING to stay with a friend*. I figured I would cancel the hotel reservation AFTER I go through immigration, just in case the immigration officers call the hotel to confirm my reservation.
Is this a good idea or should I just stay in the hotel instead?
*I thought obtaining a "formal obligation" for Schengen visa application was too much of a hassle (when you want to stay in Germany to visit a friend/relative), so I declared that I'd be staying in a hotel instead.