[The migration from time-based billing to transaction-based billing looks difficult for carriers.]

by Lucas van Grinsven, London -- "Billing a phone call will be the biggest challenge for telecom operators in the year ahead and provides a major opportunity for investors, industry specialists said.

"Increasingly, phone calls are no longer straightforward conversations between people.

"With the advent of General Packet Radio Service (GPRS), or always-on mobile Internet, over the coming months, they will also involve anything from looking at a Web page to watching a video clip, ordering a pizza or paying for the bus.

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