TELECOMMUNICATIONS | Radio masts and towers are typically tall structures designed ...

... to support antennas for telecommunication and broadcasting, including television.

Whenever you use your mobile phone to make a call, it emits electromagnetic radio waves also known as radio frequency or RF energy. Once the radio waves are emitted, the antenna from the nearest cell phone tower will receive them.
The antennas of a cell tower can both transmit and receive signals from mobile phones. After receiving the radio waves from a mobile phone, it will then transmit the signals to a switching center which is a telephone exchange for mobile phones. This allows the call to be connected to either another mobile phone or to a telephone network.