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Ipsophon
Smartphone
Pager
Videophone
One of the first practical paging services was launched in 1950 for physicians in the New York City area. Pagers also have privacy advantages compared with cellular phones. Since a one-way pager is a passive receiver only (it sends no information back to the base station), its location cannot be tracked.
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Answers by country
Ipsophon
Smartphone
Pager
Videophone
answers
Australia
15
Austria
16
the United Kingdom
28
Greece
14
India
19
Germany
66
Poland
1304
the United States
25