AT&T is paying millions to be the exclusive United States provider of Apple’s much-hyped and glowingly reviewed gadget, the iPhone.
It took 17-year-old George Hotz two months of work to undermine AT&T’s investment.
Mr. Hotz, a resident of Glen Rock, N.J., published detailed instructions online this week that he says will let iPhone owners abandon AT&T’s service and use their phones on some competing cellular networks.
