ANSWER:
When you talk through a phone, it receives your voice and generates unique sound waves, the device collects the data and converts it into electrical impulses. Inside each terminal is a digitizer that receives these pulses and converts them into a sequence of zeros and ones.
Next, this data goes to the processor of your phone, which has registered the information about the telephone operator to which you belong. Here, the information of the sender, who is calling, is merged with that of the receiver, who receives the call.
Finally, all the data that your phone has collected - the voice, the message, and the information - are converted into electromagnetic waves sent into space looking for your operator's antenna.