Idk know about the sim,but RC6 is for Apple TV I believe. I used gp RC5 to JB mine untethered and it worked like a charm. If for unlock too then idk cause I don't do that. Just look in forum. Anyway hope I helped.
Anyone been able to get this to work on a 3G and a 3GS? I've run this on 2 iPhone 4's running 4.2.1 with no problem. Following the same procedures on a 3G updated to 4.2.1 Greenpoision goes through the countdowns holding buttpns and releasing then at the end of that it keeps saying Try again? At that point the 3g requires a complete restore and update to get back to where I started.
I have not tried the 3GS yet after the experience with the 3G.