Taken from a Slashdot post by vux984 (928602) "Alter Relationship" on 22:40 18 June 2009 (#28381983). It eloquently describes why mobile networks choose to restrict so-called mobile tethering. They're not as evil as you think.
Have they gotten to the point where they have actually tricked you into thinking there's a difference?
There is a difference. Its subtle, but important. But its not a technical difference it has to do with with service levels, over selling, marketing, and pricing. But that doesn't mean its any less "real.
Essentially, when they give you a 6GB data plan they are overselling their capacity. They know this. I know this. And now you know this. Its not a secret, its not 'teh evil'. If -everyone- used 6GB every month they'd be unable to deliver the service reliably at that price.
Hi end users are subsidized by low end users. Low end users are happy that they have 6GB and don't have to worry about bandwidth everytime they check their email. The carrier has a good idea what the distribution of users is, and knows that it can offer 6gb for $30 bucks, overselling what they can actually deliver at that price, but secure in the knowledge that the mathematical models of their customer's usage patterns virtually gaurantee they won't have to.
But that all assumes no tethering. Its a no brainer to sell 'unlimited data' to a blackberry user a couple product cycles back-- the thing only did email really well, and web browsing poorly. Add in tethering, and suddenly a sizeable chunk of customers on unlimited go from 'low/moderate' usage measured in the kilobytes per day to super-users in the 10s of megabytes per day. Someone that historically only checks his email on his device, getting the odd document, or mp3... well now he now downloading his operating system service pack, virus software update, while watching youtube.
The mathematical model changes. Bottom line: if they allow tethering, consumption goes up sharply for a significant group of consumers. They need to deliver more total bandwidth. That additional capacity costs more to supply and maintain. So they need to charge more for it.
And so we have 'no tethering' in some areas or 'tethering feature' charges in other areas. As as we move forward, the devices become more powerful, and its actually possible to use significant bandwidth on them, but even now, bandwidth usage per unit for untethered use is an order of magnitude lower than what tethered users use.
The carriers fear they would be unable to deliver reliable service at that level at that price point with wide spread tethering. So they're beign cautious about it, and looking to tier the service so that people who need it pay for it.
A final word out to those who despise over-selling and thing the ISP shouldn't do it. Shut the hell up. We, the /. power users, benefit from over selling the most. Its our usage that is subsidized by the low end users. Its because of overselling we can get 6GB for $30 in the first place. If they got rid of overselling the prices we'd pay would shoot sky high, and we'd all pay by the megabyte or some other metering right from the first byte. That would suck.
That's not saying that ISPs are angelic entities looking out for us, but overselling is good business that generally benefits the consumer with lower prices and services offered in a form that we like (I want a 6GB plan more than a plan that charges me 1$ per MB. Over selling and makes efficient use of the available resource...it a case of the free market actually working.
