AT&T; Verizon Communications Inc.; China Mobile; Vodafone; Telstra; China Telecom; Deutsche Telecom; SK Telecom; Saudi Telecom Company; T-Mobile USA Inc.; Ericsson; Bharti Airtel Limited; Korea Telecom; BT Group; Qualcomm Inc.; Orange S.A. ; Alcatel-Lucent S.A.; Telecom Italia ; Nokia Siemens Networks