iOS 6.1 bug lets anyone bypass iPhone lock screen

A bug in iOS 6.1 allows anyone to unlock a device and access data stored on the device without knowing the passcode.

A security problem with iOS 6.1 could potentially allow anyone to bypass the lock screen on a device running the OS and access the data on the phone.

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The issue allows anyone who knows the trick to unlock a phone and access call logs, contacts, favourite contacts, make calls and even access photos on the device by trying to add a photo to a contact.

The issue was uncovered by YouTube user videosdebarraquito and involves quickly making and cancelling an emergency call and holding down the power button.

The iOS 6.1 operating system has suffered a number of bugs including excessive logging issues when connected to an Exchange server . It also had issues with 3G that lead UK network operator Vodafone to advise its customers not to update their handsets until the problem had been rectified.

A subsequent update to iOS 6.1.1 led Vodafone to tell customers to go ahead and update . It's also not the first time that an Apple update has left handsets vulnerable — iOS 4.1 had a very similar issue that let anyone bypass the lock screen.

Apple had not responded to a request for comment at the time of publication.