Firstly, I apologise for my lack of knowledge on this matter. It's not something I've looked into in the past 2.5 years I've been using iDevices. I understand that a new 'Greenpois0n' application can be used to 'Jailbreak' my iPhone 4 running iOS 4.1. I understand the term Jailbreak (in a simple form), and understand that it does/may void my warranty. There are a few things I'm unsure about and are putting me off trying this craze... 1. I do not rely on an 'unlock'. My iPhone is locked to O2 - I use an O2 SIM card, and have a contract with them. I'm happy with that. Does this mean I can skip the bit about preserving my baseband? Or backing up my 'SHSH blobs'? 2. Once Jailbroken, does iTunes work as normal with the iPhone? i.e. Sync with Music, etc.? 3. Is it really worth it? The primary reasons I'm looking at Jailbreaking are for the Wi-Fi hotspot apps, and the swish looking themes you can install. 4. Does clicking 'Restore' on iTunes (with a Jailbroken iPhone) bring back a completely fresh iPhone 4 again? i.e. No Jailbreak trails/apps left on there? Essentially, I'd like to try it. But Apple being Apple will kick me whilst I'm down if I manage to screw it all up. I'm a cautious guy - especially when I'm paying £1000 for my mistake. Thanks in advance for any advice/guidance, much appreciated.