A telephone could be leased for $20-$40 a year
Alexander Graham Bell
He was born on March 3, 1847, in Scotland. He was educated to pursue a career in speech and taught the deaf.When Bell began experimenting with electrical signals, the telegraph had already been a big deal. His idea stemmed from a "multiple telegraph" that allowed two telegraphs to communicate privately. When experimenting he realized he could hear sounds through a wire. When he realized this, he went further this way and abandoned the multiple telegraph.
Why is it useful?
It was invented for everyone who needed to communicate with others. It's useful because it gets messaged across the world in a matter of second. The ease and quickness of this invention has made life much easier. The purpose of it was to make telegraphy easier to use and understand but turned into much more.
"The nation that secures control of the air will ultimately control the world."
Telephones are sold at basically any store that contains electronics, for example Wal Mart, Best Buy, etc. There are many companies that offer phone service including AT&T, Sprint, Verizon, etc.