So I was able to jailbreak, and unlock a 3gs on 5.0.1 using redsn0w and ultrasn0w. A Tmobile SIM card I have been using for quite a while now (few years) works fine in the 3GS. However, when I plug my wife's new Tmobile SIM card into it, the 3gs says "No SIM installed". Is there some sort of change between old and new sim cards that I'm not aware of? How can I go about to remedy this? Any help would be greatly appreciated guys.