Can Apple + AT&T Shut Down iPhone Unlockers?

aalobode writes "Do Apple and AT&T have the legal right to stop hackers from selling unlocked iPhones? Under their terms, only AT&T may sell iPhones, and Apple gets a commission. When unlocked iPhones are used on other providers' networks, AT&T and hence Apple get nothing beyond what they earned on the initial sale of the hardware. Can they prohibit unlocking? Reselling? The article in Businessweek gives the for and against arguments, but leans toward the view that the hackers may have the law on their side for once."