Last March AT&T started to chase ts customers who had jailbroken their iPhone so that they can install software allowing it to share its connection with a computer without paying a specific fixed price.
The company starts out again with a more beautiful attack and sent to certain customers missives where they are summoned to cease these practices. If not, they and even without their assent they will automatically be registered for the official offer of Tethering of 2 GB per month for 45$.
For the moment, the French operators do not seem very eager to start in this kind of hunting of their customers. It should be said that competition is increasingly hard with the MVNO and soon Free and actually the most important is the loyalty of its customers, and not to upset them one way or another.