Warning: high-speed danger ahead: the great broadband disruption is about to hit cellular. That...

These are precarious times for mobile operators. The old voice business is declining and the new 3G networks have not created the anticipated bonanza.

Too bad. Now cellular must face the biggest disruption of all: broadband. The coming of HSDPA is going to up-end the mobile business as we know it.

From one end, the arrival of mobile broadband spells danger. It means voice over IP over cellular, and all that follows for conventional voice and roaming revenues.

But it also means genuine high-speed Internet access speeds for music, video and other d