so i never got into the jailbreaking stuff but now since i got an ipad, i kinda want to so i can tether. but reading through some posts im a little confused. i know i want an untethered JB but it sounds like if you have a virgin 4.2.1 phone you cant jb due to know blobs or what have you. is this the case? do you have to have a previous jailbreak, or once out of beta i will be able to. i really am trying to search through posts but get more confused as each thread isn't consistent with answers. is there a "definitive" resource i should read?