This question gets asked a lot on how to use Multiple Apple ID’s with iPhones, iPads and such
http://www.imore.com/how-use-multiple-apple-ids-one-computer-and-itunes
iOS 6.1.3
Apple has released iOS 6.1.3 Update Today. This fixes the passcode bypass bug. To install the upgrade go to Settings on your IOS Device. Once in settings go to General and then go to Software Update and Install.