My question seems to be one that a lot of people would have, but despite all my searching I have not been able to find an adequate answer and I was hoping you could help. I'm going to try and be as detailed as possible. I have a jailbroken AT&T iPhone 4 on firmware 4.3.1. I want to sell this phone on eBay and upgrade to the iPhone 4S. I want to sell the phone jailbroken and unlocked (to get more money for it), but I also want to ensure I've removed all personal information first. I've jailbroken/unlocked phones before, but I've never done it with the intention of also keeping all personal info off the phone. I've seen a few other threads attempting to answer this question, but the answers are very general and not detailed enough, for example: - Remove SIM card - Restore iPhone to factory settings - Jailbreak & Unlock (more valuable) - Sell on ebay and advertise Jailbreak & Unlocked Can someone help me understand the specific steps I need to take, from the moment I get my iPhone 4S to the moment I sell my iPhone 4? I presume step 1 is that I plug my iPhone 4S into my computer and activate it on my number. What is my next step involving my iPhone 4? It seems there are two ways to remove my personal info: to restore it or to use "Erase All Content and Settings". I imagine that both those steps effectively undo my current jailbreak and I have to plug the iPhone into the computer to do anything with it. Can I restore my old iPhone 4, removing all info, then jailbreak it, even if I've already activated my 4S on my number? Where is my SIM card through all this? Ideally I'd like to sell an unlocked iPhone 4 with none of my data on it that the buyer can just plug in, activate and go. Sorry for sounding like a complete newbie, but I hope someone who's done this before can explain it in detail.