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These "0G" systems were not cellular, supported few simultaneous calls, and were very expensive.
The first handheld mobile cell phone was demonstrated by Motorola in 1973.
Several other countries then followed in the early to mid-1980s.
These first-generation (1G) systems could support far more simultaneous calls, but still used analog technology.
In 1991, the second-generation (2G) digital cellular technology was launched in Finland by Radiolinja on the GSM standard.
This sparked competition in the sector as the new operators challenged the incumbent 1G network operators.
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A mobile phone is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.
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