I'm new to Jail breaking, though I've had my iPhone since July. It's a 3G and running on O2 here in the UK. I'm not looking to unlock my phone, just customize the theme and stuff. Can people just run down a few things for me? What is a baseband? What is Yellow Sn0w? I keep seeing the above cropping up everywhere and causing problems for some but I don't have a clue what they are and how they could/would affect me? I'm running 2.2.1. I'm kinda anxious as I don't wanna "brick" it, nor make it so I can't use Safari or anything like that ('cos I see people's "modems" are being hit). I guess I'm looking for a bit of reassurance and just some general info. Thanks.