Why did someone book a hotel and I got a text message?

1, because you left your phone number when you booked a hotel, there is another case where someone else filled in the wrong number when booking a hotel and wrote his number as the other party's number, so you will send a text message after booking successfully.

2. In other cases, there is something wrong with the hotel system, and there is a situation of sending messages indiscriminately. The situation is that others pretend to be hotels and send messages to users. In case of violation, the hotel can keep someone else's phone number or bind your phone number to his account.