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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.

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).

Mitchell In 1983, the Dyna TAC 8000x was the first commercially available handheld mobile phone.

When you’re ready to leave the courthouse at 13 century problem,” Jacqueline 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".Samples of adults reached via cellphone are much more demographically representative of the U. But while cellphone surveys can produce high-quality data that in some ways are superior to results of current dual-frame (landline plus cellphone) designs, neither Pew Research Center nor the telephone survey industry more generally is poised to immediately drop landline samples.Landline interviewing is roughly 30%-50% less expensive on a per-interview basis than cellphone interviewing.Most modern mobile telephone services use a cellular network architecture, and, therefore, mobile telephones are often also called cellular telephones or cell phones.