Okay, I have installed the unlock. I use Rogers PPD when traveling in Canada and I have an ATT phone. When inserting the Rogers Sim, I can log on to the AT&T network, and RECEIVE calls. But everytime I try to dial out-the call fails INSTANTLY. Have read and tried most of the suggestions on the iphone dev team blog-includng the boss preferences trick, the airplane mode trick, and the remove/insert sim thing and nothing has solved this problem. Anyone else getting yellosn0w to work with Rogers? Or if you had similar problem, please advise! Thanks!