I received the news of air tickets, hotel reservations and welcome in different places from China Unicom. People are not here, hundreds of kilometers away. What is the reason?

A mobile phone is equivalent to a radio transceiver. Your mobile phone has been transmitting and receiving signals. The base station is equivalent to a large transmitter and receiver. If you move around these base stations, the base stations will find you. As for the distance, the base station will also capture your weak signal, and the base station will record your transmitting position and transmit it to the nearest city.