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SOMA Networks knows that the communications industry doesn't sleep. The company is a manufacturer of WiMAX wireless networking equipment used by local telephone companies and Internet service providers. SOMA's products include network base stations, wireless modems, and software products that enable carriers to connect residential and business broadband subscribers to their networks. The company has sales agreements with communications products integrators including Cadmus and Zentek. SOMA, founded in 1998, counts Mizuho, Daiwa Securities, Ridgeway Capital Partners, and Sharp Corporation among its investors.

Sonim Technologies makes products that make mobile voice- over-IP communications better. The company manufactures servers and software that allow mobile wireless carriers to provide features like push-to-talk (walkie-talkie) and direct voice messaging. The company has also produced a rugged GSM mobile phone designed for use in harsh environments. Founded in 1999, the company is headquartered in San Mateo, California, and has additional offices in India, Italy, Sweden, and the UK. It has also acquired a software development center in Bangalore, India. Investors include 3i, Accel Partners, Apax Partners, and BV Capital.

Sony Ericsson Mobile Communications wants to build a better voice trap. The joint venture between Japan-based consumer electronics maker Sony and Sweden-based Ericsson combines the cell phone operations of both companies. It was established to draw on the wireless technology of Ericsson, the world's leading maker of wireless network equipment, and Sony's expertise in developing popular consumer gadgetry; the companies phased out their separately-branded phones in favor of co-developed models. Sony Ericsson is squared off against such cell phone stalwarts as Nokia and Motorola, as well as Samsung. Sony and Ericsson each own half of the venture, which was founded in 2001.

Spectrum Signal Processing's devices and software address a spectrum of signal processing needs. The company offers signal processing subsystems and software-defined radio transceiver devices used in a variety of applications, including cellular base stations, signals intelligence, military communications, and test and measurement equipment. Spectrum discontinued its line of voice-over-packet products, which were designed for telecommunications functions. Top customers include Agilent, General Dynamics, Lockheed Martin, Raytheon, and the US Department of Defense. The company has offices in Canada, the UK, and the US. Spectrum Signal Processing is a unit of Vecima Networks.

Spring Communications jumped headfirst into the mobile communications business in 2001 as a retailer of mobile phones and service. The company provides wireless communications products and services to more than 1 million customers in Utah and Colorado. Now an authorized AT&T retailer, Spring Communications sells a variety of phones, accessories and services including voice, SMS, and high- speed wireless data services through its chain of about 75 retail stores. The company was founded in 2001.

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