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Thomas Watson waited in the next room . He had a wire and a receiver . Alexander Graham Bell was on the other side of the wall , and he wanted one simple thing . He wanted Watson to hear his voice . Bell came from Scotland and lived in America . He worked with people who could not hear , so he thought about sound all day . In the laboratory , he and Watson tried to send sound along a wire and turn it back into sound . For a long time Watson heard only scratches . He did not hear words . In those years a voice could not travel to another city . If you wanted to speak to a friend far away , you wrote a letter . You put the paper in an envelope and you waited . A letter could take days . A wire could already carry a code of short and long sounds . A code was not a person speaking . On March 10 , 1876 , Bell spoke into the machine . He said , " Mr . Watson , come here . I want to see you . " Watson heard the sentence . He stood up and walked into Bell's room . People still tell this story . It was not a long speech . It was one man asking another man to come through the door . The early telephone was a wooden box on a wall . You talked into a funnel , and you listened at a small piece by your ear . You did not press a button . You spoke to an operator . The operator sat with many cables and joined your line to another line . Then two people could talk . Later , a telephone could sit on a table . On some phones you put a finger in a hole and turned a round dial , one number at a time . In the 1960s , phones with buttons appeared . You pressed the number , and the call started faster . The machine changed . The wish stayed the same . Someone still wanted another person to hear them . In 1973 , Martin Cooper , at Motorola , made a call on a mobile phone . The phone was large and heavy , about the size of a brick , and he could walk with it . He did not have to stand beside a wall . In 2007 , Apple showed the iPhone . The screen was flat . A finger could open a photo , a map , or a message . It was still a telephone . It still carried a voice to someone who was not in the room . Watson heard his name and came through the door . A person called , and another person answered .
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