There has been a vulnerability in iOS7 which has been exploited by users to bypass the unlock screen on iOS7 and it really simple to do. The same has been demonstrated in the video mentioned below and I know this no big news to be talked about but the twist is that after Apple released their iOS 7.0.2 to take care of this problem. Users have found another way to bypass the lock screen, in other words this problem still persists.
Initially if you could launch the control center and then tap the alarm icon, then long press the power button and then cancel the power off option. Now double press the home button and then choose any other application which has been opened on your iPhone. You will be able to access those applications. With the update of iOS 7.0.2 you will not be able to bypass the screen in the same but as per the video mentioned below you will be able to bypass it by following other steps.
You will use the help of Siri or the Voice Control to call through Facetime and then once the dialing screen appears click the sleep button. Now swipe towards the right to give the unlock gesture to the phone which will again take you back to the call. You will the facetime call and then you will reach the phone application which will leave out all the applications open to you as mentioned in the previous trick.
To overcome this problem you can toggle off the option to access Siri from the locked screen and this save your iPhone to get accessed by unwanted elements. I wish if Apple could be able to launch applications specific locks which could really save lots of trouble for the iPhone users. This feature will even help the iPhone users who do not want to lock their phone with passcodes but are only doing so because as per their workplace policy if they configure their iPhones with the Exchange server then it should be locked with a passcode. Please let us know if you face any problem while following the steps of this tutorial.