[wazoox]

I'm using regularly the same trick to use free tethering with my phone. As I didn't buy some incredibly expensive option that explicitly allows it, simply declaring my firefox as a mobile browser allow to bypass the artificial limitation.

I certainly don't abuse it; simply from time to time you need some internet access (to check an email, to download some piece of software, to google for a technical problem) and I wouldn't pay 39 euros/month for a 3G "key" that I'd use maybe once a month, no thanks.