Why is there no signal when the mobile phone enters the hotel, but the signal when entering the Internet cafe is good?

There is no signal when the mobile phone enters the hotel, and there may be the following reasons for the good signal when entering the Internet cafe:

1. The signal coverage of the hotel is limited. If your mobile phone is too far away from the base station or in the blind area of signal coverage, it may cause the mobile phone to be unable to access the network. Internet cafes are generally located in densely populated areas, and the base station signal coverage is good, so the cell phone signal is strong.

2. There may be many buildings and metal objects around the hotel, which will interfere with electromagnetic waves and lead to weak or unstable cell phone signals. Internet cafes are generally located in commercial areas or densely populated areas, and there are few surrounding buildings, so the cell phone signal is relatively strong.

3. There may be signal shielding devices or jammers in the hotel, which will interfere with the transmission of mobile phone signals, resulting in signal quality degradation or inability to access the Internet. Internet cafes generally don't use these devices, so the cell phone signal is better.

To sum up, there is no signal when the mobile phone enters the hotel, and the reason for the good signal when entering the Internet cafe may be that the signal coverage inside the hotel is limited, the surrounding environment interferes with electromagnetic waves, and there are signal shielding devices or jammers inside.