I want to use my current SIM because I have a better price on voice and unlimited data. I'd like to be able to update my iTunes to 7.4.1. That said, is it possible to "jailbreak"my phone to use the old SIM and also use Installer.app to install things such as NES? I'm getting confused with all the iTunes updates, new jailbreaking apps, etc. I've researched on hacktheiphone.com but can't seem to get an up-to-date idea of whether or not its possible. Thanks!