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From his notebook, Alexander Graham Bell drafted the telephone.
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In the 1940's US Army would use radio transmission to communicate messages in the field.
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The commercial model was released in car phones. These phones used radio signals to communicate.
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In 1983, the first commerical use cellphone was released for usage.
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Currently, Smartphones such as the iPhone can be found all around the world.
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.