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By contrast, smartphones generally use a mobile operating system that often shares common traits across devices.
The first handheld mobile phone was demonstrated by John F.
A handheld mobile radio telephone service was envisioned in the early stages of radio engineering.
In 1917, Finnish inventor Eric Tigerstedt filed a patent for a "pocket-size folding telephone with a very thin carbon microphone".
Early predecessors of cellular phones included analog radio communications from ships and trains.
The race to create truly portable telephone devices began after World War II, with developments taking place in many countries.