Want to unlock/jailbreak straight talk samsung galaxy precedent without SIM card.
Jailbreaking in IOS is rooting in Android. You root the Precedent (gain access to the root login) by using rtto at http://codegeekbbs.com/samsung.php Just follow the directions you'll find in the file. Just read the Readme.txt file.
Unlocking is making the phone run on other carriers' towers - and you can't do that with a CDMA phone without pretty much rebuilding the phone. (CDMA phones don't have SIM cards, only GSM phones do - the technology is different.)