I just want to quote this:
Nevertheless the 3G service poses a threat to cellular operators because it allows users to bypass their networks and make calls over an Internet telephony service like Skype
And then say the following to the Author: "You Dumb, uninformed nitwit". He obviously has NO CLUE how mobile operators work and he has even LESS information about the technical and operational aspects of 3G. I think he drew the word "3G" from his "word-of-the-day" hat and decided to use it in a sentence for the first time. Unfortunately, he still managed to stuff it up, but a big "A" for effort to him.
MTN, Vodacom and even CellC (when they get round to it) are the "hosting" companies for 3G technology. You cannot "Bypass" the cellular operator and then still use 3G. It's like saying you're going to "bypass" telkom but still use their landlines to make a call....er....I don't think so Jimmy!
But let's take a look at this from another aspect, let's see if we can make sense of this ill-written article. Maybe the author is trying to say that by USING 3G to make an international call using VoIP, it will mean that Mobile Operators will be losing out on money. WRONG AGAIN SIR. Make a quick 2 minute phone-call to a friend using the normal means....write down the cost. Now, make the same 2 minute VoiP call to the same friend...write down the cost....Not that cheap, is it?
This reply is a bit of a rant but it seems to me that the author honestly does not know what he's talking about and he's trying to make a mountain out of a molesheap.
In Summary: You CANNOT "bypass" the mobile operator and then still use the service that it provides. And making a call using VoIP through 3G/GPRS is not as cheap as you might think.