Editing History of radio (section)

==Mobile phones==
{{Main|History of mobile phones}}

In 1947 AT&T commercialized the [[Mobile Telephone Service]]. From its start in St. Louis in 1946, AT&T then introduced Mobile Telephone Service to one hundred towns and highway corridors by 1948. Mobile Telephone Service was a rarity with only 5,000 customers placing about 30,000 calls each week. Because only three radio channels were available, only three customers in any given city could make mobile telephone calls at one time.<ref name=GS2006>Gordon A. Gow, Richard K. Smith ''Mobile and wireless communications: an introduction'', McGraw-Hill International, 2006 {{ISBN|0335217613}} p. 23</ref> Mobile Telephone Service was expensive, costing US$15 per month, plus $0.30–0.40 per local call, equivalent to (in 2012 US dollars) about $176 per month and $3.50–4.75 per call.<ref name=att1946>{{cite web |url= http://www.corp.att.com/attlabs/reputation/timeline/46mobile.html |title= 1946: First Mobile Telephone Call |year= 2011 |work= corp.att.com |publisher= AT&T Intellectual Property |access-date= 2012-04-24 |archive-date= 2012-12-12 |archive-url= https://web.archive.org/web/20121212113039/http://www.corp.att.com/attlabs/reputation/timeline/46mobile.html |url-status= dead }}</ref> The [[Advanced Mobile Phone System]] analog mobile phone system, developed by [[Bell Labs]], was introduced in the Americas in 1978,<ref name = "Testing the First Cell Phone Network">{{cite web |author=AT&T Tech Channel |url=http://techchannel.att.com/play-video.cfm/2011/6/13/AT%26T-Archives-AMPS%3A-coming-of-age |title=AT&T Archives: Testing the First Public Cell Phone Network |publisher=Techchannel.att.com |date=2011-06-13 |access-date=2013-09-28 |archive-date=2013-10-29 |archive-url=https://web.archive.org/web/20131029194138/http://techchannel.att.com/play-video.cfm/2011/6/13/AT%26T-Archives-AMPS%3A-coming-of-age |url-status=dead }}</ref><ref name="PrivateLine">[http://www.privateline.com/dailynotes/index13.html Private Line: Daily Notes Archive (October 2003)]  by Tom Farley {{webarchive|url=https://web.archive.org/web/20120610001231/http://www.privateline.com/dailynotes/index13.html |date=2012-06-10 }}.</ref><ref name = "MilestonesPast">[http://www.milestonespast.com/exbringing.htm  "Turning on the Future: October 13, 1983"] {{Webarchive|url=https://web.archive.org/web/20111006011650/http://www.milestonespast.com/exbringing.htm |date=October 6, 2011 }} by Kathi Ann Brown (extract from ''Bringing Information to People'', 1993) (MilestonesPast.com)</ref> gave much more capacity. It was the primary analog mobile phone system in North America (and other locales) through the 1980s and into the 2000s.

The development of [[metal–oxide–semiconductor]] (MOS) [[large-scale integration]] (LSI) technology, [[information theory]] and [[cellular network]]ing led to the development of affordable [[mobile communications]].<ref name="Srivastava">{{cite book |last1=Srivastava |first1=Viranjay M. |url=https://books.google.com/books?id=fkO9BAAAQBAJ&pg=PA1 |title=MOSFET Technologies for Double-Pole Four-Throw Radio-Frequency Switch |last2=Singh |first2=Ghanshyam |date=2013 |publisher=[[Springer Science & Business Media]] |isbn=978-3319011653 |page=1}}</ref> The [[Advanced Mobile Phone System]] analog mobile phone system, developed by [[Bell Labs]] and introduced in the [[Americas]] in 1978,<ref name="Testing the First Cell Phone Network" /><ref name="PrivateLine" /><ref name="MilestonesPast" /> gave much more capacity. It was the primary analog mobile phone system in [[North America]] (and other locales) through the 1980s and into the 2000s.