David Williams

VantagePoint Management, Inc. (VantagePoint) is a venture capital firm founded in 1996 by Alan Edward Salzman, James D. Marver. The firm is headquartered in Santa Barbara, California with additional office in Beijing, China.

Cingular Wireless provided mobile voice and data communication services in the United States. It operated digital voice and data network in the nation under the name ALLOVER(SM) network. The company provided the wireless carrier to offer Rollover(SM), the wireless plan that lets customers keep their unused monthly minutes. Cingular Wireless was headquartered in Atlanta, GA.

GSM Association functions as a association representing interest of mobile operators. It offers programs and advocacy initiatives including future networks, identity, and internet of things, industry purpose, mobile for development, spectrum and the mobile economy. The company was founded in 1982 and is headquartered in London, the United Kingdom.

O2 Plc used to provide mobile communication services. It used to provide wireless voice telecommunications services including cellular, mobile, paging and unified messaging. The company was founded in 1985 and was headquartered in Slough, UK.