• AT&T
• Aware, Inc.
• British Telecom (BT)
• CenturyTel
• CT Communications
• Deutsche Telecom
• Embarq
• Ericcson Mobile
• France Telecom
• Frontier Communications
• GCI (Alaska)
• GlobalStar
• Hellenic Telecom (Greece)
• IDTC
• Iowa Telecommunications Services
• L3 Communications
• Level 3 Communications
• Lucent Technologies
• Motorola
• Nippon Telephone and Telegraph (NTT)
• NTT DoCoMo
• Qwest
• Rostelecom (Russia)
• Shenandoah Communications Company
• Sprint Nextel
• Telefonica SA (Spain and Latin America)
• Telus (Canada)
• Telstra (Australia)
• US Cellular Corp
• Verizon  
• Vodafon
• Warwick Valley Telephone Company

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