We would like to remind customers modifying the baseband (free software unlocking) on your phone is hazardous and can result in permanent damage to your iPhone. Modification of the BaseBand is also detectable and will void your warranty. In short you stand the very real chance of being stuck with a broken phone and no warranty to get it repaired. Therefore we advise customers to avoid anything which involves modifying the BaseBand on your iPhone.
all information can be found on this website
installation information also, which is extremely easy
This is not a cheap knock off (brown coloured ones) that I have witnessed do not work.
This will work with all iPhones, with all sim cards except for the 3 network
This is the newest version of the StealthSim, Black Verison, not Green