Because of well-documented abusive behavior towards customers, I recommend to anyone to really minimize any connections or dependencies with carriers. I don't trust the carrier enough to engage in any "discounts" or "deals" with them. I don't have time to untangle their games.
Fair enough. I've had good experiences with Verizon (their iPhones are all unlocked) but other carriers you do have to jump through some hoops if you want to leave etc.