Many travelers avoid giving their real contact information because they do not want spam. That is understandable. But incorrect contact information can create serious travel problems.
Hotels may need to reach you because of a declined credit card, overbooking, maintenance issue, weather emergency, power outage, city order, room-type problem, or another matter that affects your stay.
If the hotel cannot reach you, you may not know about the problem until you arrive.
Smart guest tip: Create a separate travel email address and use it for hotels, airlines, restaurants, and travel apps. Give hotels a working phone number so they can contact you when it matters.