Ciaran O'Riordan ciaran@fsfe.org writes:
Your access can only be blocked *if* you modify in a way that harms their network.
Mobile phones are a better example than Tivo for this.
GPLv3 says that it is ok if phone manufacturers want to make the device cut off network access when modified versions of the software try to broadcast or listen to forbidden wavelengths.
For more on the general topic of phones and free software, see: http://lwn.net/Articles/226446/