I've had this old iPhone 3G laying around that I want to put on eBay and I'll get more money if I unlock it but I'm a bit confused. I'm reading all sorts of stuff from using Redsnow to upgrading the IPSW with an iPad version...but all the stuff seems to be from Nov/Dec last year. What's the definite answer here? What do I need to use to jailbreak and unlock the phone? I'm on a Mac computer. Thanks.