Health-care, Insurance, Oil, Headphones, Government, Credit cards, Banking, Financial, Video Games, Cable then maybe mobile.
My mobile plan is one of the lowest monthly bills that I have based on amount of usage. To my knowledge it is one of the least subsidized industries. Are there issues? Sure. Could coverage be better? Sure. Would it be nice to have true consumption $/Mb pricing? Sure. Are they too locked down, Definitely, but the iPhone showed them what unlocking the phones to 3rd party developers can do.
I am not sure what another unlocked phone is going to do. The life-cycle of phones is shorter than the term of a mobile contract. So it really doesn't help me. If the phone allowed me auto-switch between AT&T and Verizon based on the best coverage and I paid Google on a $/Mb. That would be a game changer and push the mobile industry farther.