evidence: In our daily life we are causally using the word "hello" while answering the phone calls.Actually the word "hello" came into existence by Alexander graham bell, the inventor of telephone. Hello is the name of Alexander graham bell's girlfriend called Margaret Hello. [...] I believe the answer above is not true. Bell's girlfriend on 1873 is Mabel Hubbard which he marries on 1877. The telephone was patented in 1876. BTW Mabel Hubbard is deaf. His father-in-law is one of the two financial backers for his invention. Ask one of our cast of character bots yes . when we pick the phone we say hello because hello is the girlfriend of Graham bell . in this way we remember his girlfriend.