who is credited with suggesting the word hello be used when answering the phone
Hello The use of hello as a telephone greeting has been credited to Thomas Edison; according to one source, he expressed his surprise with a misheard Hullo.[11] Alexander Graham Bell initially used Ahoy (as used on ships) as a telephone greeting.[12][13] However, in 1877, Edison wrote to T.B.A. David, the president of the Central District and Printing Telegraph Company of Pittsburgh:
Martin Cooper (inventor) While at Motorola in the 1970s, Cooper invented the first handheld cellular mobile phone (distinct from the car phone) in 1973 and led the team that developed it and brought it to market in 1983.[3][4] He is considered the "father of the (handheld) cell phone"[1][3][5][6] and is also cited as the first person in history to make a handheld cellular phone call in public.[7]