I have a iphone firmware 3.1.3 i was about to jailbreaking with sprint but it says something about "If you currently are using a tethered jailbreak, you have to restore to use Spirit. Do not upgrade if you use an unlock on an iPhone 3G or 3GS. (You can, however, restore to 3.1.2 if you have SHSH blobs for that version.)" When i used f0recast at http://ih8sn0w.com/index.php/welcome.snow it said my iphone is tethered How can i tell if my iphones already been jail broken? And what program do you think i should use?