Aaron posted the followings steps:
Try to slide to unlock, tap emergency call, after that, double tap the home button.
Whoola, you will find yourself in iPhone favorites. From there, you could access other menu like address book, dial keypad, and voice mail.
If you are the owner of the iPhone and wants to avoid this security flaw, you can follow the following steps.
1. In the iPhone home, go to Settings.
2. Click on General.
3. Click on Home Button.
4. Click on either “Home” or “iPod”.
By doing this, when someone is doing double tap, he/she will be redirected to the unlock screen (if you choose HOME).
The third-part software: iPhone Backup Unlocker Professional (Buy Now | Free Trial) is able to help you recover lost iTunes backup password for iOS devices including iPhone, iPad, and iPod, and enables forensic access to address books, call logs, SMS archives, voice mail and email account settings, applications, and so on in these devices.