As soon as I checked into the hotel room, I heard the sound of typing on my mobile phone.

As soon as you turn off the lights in a hotel room, you hear the sound of typing on your mobile phone for the following reasons:

1, it happens that someone in the next room is typing with a mobile phone, and the sound insulation effect of the hotel room is not good. You can hear it louder.

2. It was my hand that accidentally touched the mobile phone and the typing keyboard, so there was the sound of typing on the mobile phone.