I am planning to sell my 3GS to a co-worker. I told him that I would update to the latest firmware & jailbreak it. But, Cydia's database recognizes the phone by IMEI or serial number or something like that, right? If so, how would I get my account to no longer be associated with this iPhone? If he wishes to purchase something from Cydia, he wouldn't be able to buy anything because Cydia thinks that the iPhone is still mine. I never expected that I would need to know this info, so forgive me if this is an easy fix.