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DK Cheung

CallBlue GSM is the world’s first wireless operator to have its own proprietary network dedicated to international mobile roaming.

Callblue Gsm Press Release

12 JUL	CallBlue GSM Launches – The World’s First Wireless Network Specializing In Global Roaming
	CallBlue GSM, the world’s first wireless operator to have its own proprietary network dedicated to international mobile roaming, launched yesterday. London: CallBlue GSM Launches – The World’s First Wireless Network Specialising in Global Roaming. CallBlue GSM, the world’s first wire ...