The recent release of iOS 6.1 brought along a few bugs. One of the bugs allowed malicious persons to bypass the security code on your device. Apple released iOS 6.1.2 today, which fixes this issue as well as another related to Exchange network activity and reduced battery life.
Because of the security flaw, the HOA recommends all House Officers running iOS 6 on their devices update to version 6.1.2 as soon as possible.
Apple Support - iOS: How to update your iPhone, iPad, or iPod touch