History of mobile phones
A cellular telephone switching plan was described by Fluhr and Nussbaum in 1973, and a cellular telephone data signaling system was described in 1977 by Hachenburg et al.
Openmoko
The Neo 1973 (codenamed GTA01) phone was a "developers only" release. The device is named after the first year of cellular telephone communication: the inventor of the cellular phone, Martin Cooper, made the first call in 1973. The phone released was inconsistently-named Neo 1973 or Neo1973. The Neo 1973 was sold from July 9, 2007 to February 2008. It was priced at US$300 for the basic model, or US$450 for a kit including more tools for hardware work.