I unlocked my iphone with the method shown at modmyiphone.com and it works perfectly. As I move forward, I'm thinking what the best approach would be and checked out iphonesimfree's website. They claim that their unlock does not modify the firmware - so what does it do and how does it do it? It seems like their method did not result in a bricking of phones when Apple updated the firmware - is that because Apple targeted the free unlocks, or is it because IPSF uses a method that is less intrusive? In short, is IPSF's method better? Since I don't understand what's going on under the hood, please treat me as a complete idiot when you explain. Thanks!