iOS, Blackberry OS, and Windows Phone all honor carrier tethering flags -- if your carrier says "don't tether", the device will not legitimately tether.

We know that. It has been the case for time eternal.

We also know that carriers have long been able to detect tethering through deep packet inspection : People have been forced into upgrades, or have discovered surprising bonuses on their bill, when they tethered in defiance of that flag (whether through Android, or one of the hack tethering apps available on the other OS').

There is nothing new about this.