In iPhone iOS 6.1.1, 6.0.2, 6.0.1, a security issue has been discovered that allows you to bypass the password that blocks access to the iPhone in a matter of seconds. With this, you can use your smartphone's phone book, make voice and video calls, check voice mail, and view photos while editing contacts.
To bypass the password, you need to turn on the iPhone, press the "Emergency Call" button, and then press and hold the power key until the slider appears to turn off the device. Then you should cancel the shutdown, dial the emergency number (for example, 112 or 911), press the call button and then cancel the call.
It remains to put the device into sleep mode using the power button, then press the "Home" button, unlock the device using the slider, press and hold the power key for three seconds, and then press the "Emergency call". As reported to the resource AllThingsD in Apple, the company is aware of the problem and will release a patch in the near future. But having purchased an Apple iPhone 5c, you can be 100% sure that these nuances have been corrected and there is nothing to worry about.