When did people start using telephones?

Many inventors were working on the invention of similar communication devices, both in the US and Europe.

On February 14, 1876, a man named Elisha Grey, who had invented a similar device, submitted to the US Patent Office his intent to file for a patent on his invention; on the same day, Bell filed his completed application for a patent for his device. Grey could have converted his intent to and application for a patent, but he didn't; on March 7, 1876 Bell's US patent No. 174,465 for the telephone is granted.

Alexander Graham Bell is credited with inventing the telephone by demonstrating the first clear, two way communication March 10, 1876. Bell is credited as 'the inventor of the telephone' because he was the most aggressive of the many inventors of that time.

The Bell Telephone Company was established on July 9, 1877 in Boston, MA and began to install telephone connections.