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The first mobile phones, shown here by Post Office engineer Harry Shilling in March 1985, used analog technology. Analog is the electronic transmission of sound using signals of varying frequency carried by an electromagnetic current. Digital, or digital and analog combined, quickly became standard mobile phone technology.
Te whakamahi i tēnei tūemi
Alexander Turnbull Library, Dominion Post Collection (PA-Group-00685)
Reference: EP/1985/1159/8A
by Stuart Ramson
Permission of the Alexander Turnbull Library, National Library of New Zealand, Te Puna Mātauranga o Aotearoa, must be obtained before any re-use of this image.