First off, I've been out of the iphone unlocked scene since the 2G iphones first came out. So I've been out of the game for a while but still remember few bits and peices. Now on to the issue, I purchased a used 3G iphone that is no more than 6 months old. The seller told me it is jailbroken and unlocked ready to go. well, I popped my t-mobile sim card in but it doesn't recognize my carrier. Here are the stats of the iphone as of now. Has the 2.2.1 version, cydia and yellowsn0w installed. can someone help me fix this problem or figure out if the seller sold me a bad iPhone?