Swisscom, Strategy Analytics, KPN, T-Mobile Netherlands, Ziggo, T-Mobile International, OPTA, Vodafone Group Services, UPC Nederland, Orange UK, Samsung Electronics Benelux, Belcompany, Sony Ericsson Mobile Communications AB, Global Intelligence Alliance, Belgacom, Alcatel-Lucent, Tele2 Nederland, Samsung Electronics UK, T for Telecom, UPC, Orange Communications, McKinsey & Company France, Booz Allen & Hamilton Germany, Dutch Competition Authority, Siemens Home and Office Comm. Devices, Financial Times, The Phone House Netherlands BV, Telekom Austria, The Boston Consulting Group, Telenet, T-Mobile Deutschland GmbH, Ericsson Telecommunicatie B.V., Quintel Strategy Consulting, Qualcomm, Nokia Pte Ltd., COLT Telecom B.V., F-Secure Corporation, Ovum Europe Ltd, Sunrise-IMS, CBS, TMN Portugal, Acision, Informa Telecoms and Media, Pyramid Research, TeliaSonera AB, LG Electronics, Ofcom, and many more.