The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which provides access to the public switched telephone network (PSTN).
A feature phone has additional functions over and above a basic mobile phone which is only capable of voice calling and text messaging.
From 1983 to 2014, worldwide mobile phone subscriptions grew to over seven billion, penetrating virtually 100% of the global population and reaching even the bottom of the economic pyramid.
A handheld mobile radio telephone service was envisioned in the early stages of radio engineering.
These 0G systems were not cellular, supported few simultaneous calls, and were very expensive.
The first commercial automated cellular network was launched in Japan by Nippon Telegraph and Telephone in 1979.
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