Anyone can change to another operator. This is competition and open market.
The problem is that there are only a few with the power to change something, and they are working in a cartelized way... as it happens these days. Operators get the information to work in a cartel way from market researches. They get all they need to operate fixing prices and offer, and protect themselves. The margins are absurd and operators are making a lot of money.
Unfortunately, dumb consumers who got satisfied with the miracle of telecom, don't understand and don't have enough power to fight. Thing about it: There is no free phone. This is a cartel like way to deceive it's customers, like many other things. I hope other technologies like White Space "Super WIFI" can give the consumers some power to battle. Also, there should be organizations working as Internet providers, idenpendently.
Think about it: Services operators, of all kinds, got the advantages of disruptive technology evolution without giving consumers. The regulated market (licensed frequencies) slows competition and we are more and more on their hands.
Why not non profits for Internet, etc? Why not cooperative Internet? Hmm.... with IPv6 and users talking with each other directly, without the need for a service like Skype? Many things should be re-thought. A few people can understand how things works. Well... would like to discuss this with people aware of this situation.