do not buy this software which is being offered from www.Unlock-Apple-iPhone.com.i purchased this last sunday oct 31. 2010 inorder to unlock my 2 iphone 3GS who work with os4.1 and newest modem firmware 05.14.02.i purchased this software to be able to unlock these 2 iphones and hook them up with another provider but shortly after i downloaded into my pc noticed that this software does not unlock new modem firmware such as the one that i have on my iphoned and is the latest from apple.. this is some thing that they don't say it when some one wants to purchase it.they claim that thier software unlock os 4.1 or your money back guranty.what a losers these people are.they do not answer phone or e-mails.be careful and stay away from them.