Fact 1: Telephones are used for communication by two people by transmitting sound.

Fact 2: Cell phones are, bottom line, radios with a connection to a telephone company.

Given the two facts above, answer the question "What are used for two people for communication with sound?" with the following options: 
- cell phones
 - messengers
 - energy
 - megaphones
 - A Greek letter
 - flashlights
 - gramophones
 - electricity


 

 cell phones        