Beware that attempting to upgrade to this version of the iOS may cause problems with your iPhone and you will have to restore to default and then restore from backup. Be sure to do a backup before starting this process.

iOS 6.1.3

This update contains improvements and bug fixes, including:
• Fixes a bug that could allow someone to bypass the passcode and access the Phone app
• Improvements to Maps in Japan

For information on the security content of this update, please visit this website:
<https://support.apple.com/kb/HT1222>

The iPhone passcode can still be bypassed after the iOS 6.1.3 update: It was just yesterday Apple released the… https://bit.ly/11eixrC