How does mobile communication work?

Question

mobile connection

Good morning,
There is a tower and there is a telephone. The tower can create a powerful signal and transmit it over long distances, say 2 km.
But the phone in your pocket doesn't have that much power, how does it send back the same long distance through all the city walls?

Answer 1

In addition, antennas with a certain radius (azimuth), signal length and bandwidth are installed on each tower in a circle. All telephone exchanges that fall into the conditional "triangle" created by the tower transmitter are in the coverage area. As a rule, the subscriber is in the coverage area of ​​several antennas, and if one of the channels is full, it is automatically changed.