I am a new poster and I have read the frequently asked questions and searched the forums to make sure what I'm looking for hasn't been answered yet. I'd like to make this thread a collaborative of FACTS about using the piggyback unlock sims. I have read in the forums a couple places discussing these things but they are missing facts and don't include all of the sims available. I'd like to know once and for all EXACTLY what these sim cards do? More than just they trick the iPhone HOW do they trick the iPhone? Is the phone really safe from being bricked? The names, brands, and places where people have used them? For example people on the forums are talking about RebelSim a lot. There is also many other popular ones such as TurboSim, Kuso8888, StealthSim and more. Please if you have experience with any of these post what your experience has been like, whether it worked or not, and where you are located and what network you unlocked it for. Please add as much information as possible so we can efficiently identify possible flaws. I will keep tabs on this forum and update my original post to include as much information for people as possible. I know I've been looking for clear answers and reviews for a long time. So hopefully after I have my answers I'll be able to keep this updated so everyone elses answers can be provided also!