Touch ID works this way – whenever an iPhone 5S owner wants to unlock their device, all they need to do is swipe their finger over (it would be the thumb normally), whereas previous iPhone models required a passcode for the unlock to happen. It is also said that iPhone 5S owners are able to unlock with a passcode should they reboot or have not unlocked the device within 48 hours, and this particular safeguard will help prevent hackers from biding their time as they wait for a workaround. Not only that, it has been revealed that Touch ID does not like sweaty fingers – at all, so you might not want to try unlocking your iPhone 5S while you are pounding the treadmill. We do wonder whether in time, more real-world limitations concerning Touch ID will be revealed or discovered.