[Porsche-O-Phile]

Actually they are requiring long term contracts now with onerous penalties for breaking them to prevent this. It's not so simple as "just switch".

If your contract is up however, you can. And there's nothing saying the nice new company you sign up with (and who probably requires a contract themselves) won't impose something similar on you two or three months in. If they do, what recourse do you really have?