There is one way to brute force an iPhone called IP Box. It's a hardware device which can brute force a 4 digit pin in ~111 hours. http://blog.mdsec.co.uk/2015/

There is one way to brute force an iPhone called IP Box. It's a hardware device which can brute force a 4 digit pin in ~111 hours. http://blog.mdsec.co.uk/2015/03/bruteforcing-ios-screenlock.html http://blog.mdsec.co.uk/2015/03/bruteforcing-ios-screenlock.... But it only works on iOS 8.1 or earlier, was patched in iOS 8.1.1