ok, so now that I have the iPhone 4, I'm going to be selling my 3GS soon. I want to unlock it so that the value can go up a little bit, but my question is this - since there is not a working sim card in it, how can I clear all my info from the phone (photos, contacts, music, apps, etc) without iTunes locking it to the "Connect to iTunes" screen? This way I can clear it and still be able to jailbreak/unlock the device. And about how much could I ask for it? Perfect condition, black, 16GB and a few cases - once unlocked I was thinking $300, is that about average? Thanks in advance.
$300 is pushing it...but its not impossible, especially if it's in mint condition. It might take a while to sell at that price though...$250 and you're pretty much good to go quickly on eBay or Craigslist.
As far as the sim card issue...you can pull the SIM (as long as it was activated at one time) and it will still work through WiFi and the iPod will still function. You can simply erase all of your information from the phone manually and do the jailbreak/unlock through WiFi.
Ah, nevermind, I took a chance and plugged it in to iTunes and was able to delete all my music, contacts, photos, etc and not have it locked to the "Connect to iTunes" screen. So now to rejailbreak and unlock. Thanks!
Redsn0w is pretty much your only option right now...you have to download that and your 4.2.1 firmware (as a separate file) and then follow the instructions...FYI, redsn0w's tethered JB means that anytime the phone is powered down, reset (through cydia or whatever), or the battery dies...cydia wont work (rendering the JB useless) unless it is reset through redsn0w (the program has the jailbreak process AND a tethered reset process within the download).
Its honestly a pain in the ***...which is why so many are eagerly awaiting the untethered JB, rumored to be coming any day now.
If you just flashed the official 4.2.1 than the chances of getting unlocked and keeping the GPS aren't good. Just sell it as is with no jailbreak either. I have been tracking these on eBay and the 32gb ones are easily getting in the $300's. You aren't adding any value jailbreaking so just list the iOS version, baseband and if it has any shsh available so people can come to their own decisions.
$300 is less than half the price of an iPhone 4; I wouldn't call anyone a "fool" for buying a 3Gs and I actually think it's a sweet deal. Not everybody throws out their cellphone as soon as a new model hits the store.