I don't think they would really care unless you (or many others) started disrupting the network or abusing their services. Unlike Cable TV companies, network op

I don't think they would really care unless you (or many others) started disrupting the network or abusing their services. Unlike Cable TV companies, network operators don't generally have a revenue stream that must be protected by locking down what you can do with the baseband. Whatever traffic filtering they do to keep Skype etc. out is done in the network.