I got an iphone 3G with 4.2.1 the other day and wanted to jailbreak/unlock to use my Tmobile sim card. I researched for hours beforehand and followed all instructions correctly. I downloaded redsn0w, installed cydia, but then discovered I needed the iPad Baseband. So i had to dwnload a new redsn0w (the one I used beforehand didn't have the iPad BB option) and after downloading the iPad Baseband, my iphone was stuck in recovery mode!! The solution to this was to then download TinyUmbrella and downgrade to 3.1 to get it out of recovery mode. So now I'm stuck with this 3G iPhone with 3.1 and ipad 06.15.00 BB and I have no idea how to jailbreak/unlock. Redsn0w hasn't worked yet to even jailbreak, but that's probably because it doesn't recognize my 3.1 ipsw for some reason and I have to use the 4.2.1..anyways..i'm just lost now. Also, I can't upgrade to any other firmware like 4.2 or even 3.2.1. The iPhone is only working with 3.1. Can anyone guide me through jailbreaking and unlocking this thing??