I posted this article titled, "Innovation - the Apple way" a couple of years ago. Though the title doesn't convey it right off the box, this article is mainly about Touch ID that Apple introduced in the iPhone 6. It truly (yet again) changed the way modern smartphones work. Yes there were fingerprint scanners before Touch ID but they never went mainstream and their implementation even on non-Apple smartphones was never as good as it is today. And the only credit for this goes to Apple. I am so used to Touch ID on my iPhone that I am longing for one on my MacBook Pro. I am not sure how that will work but recent rumors definitely suggest that there is some fire to this smoke.
Anyway while I was speaking a friend of mine last weekend I observed something interesting. He is a fairly tech savvy person and I generally have some intriguing discussions with him and he is a long time iPhone user like me and he generally upgrades his iPhones regularly. However on a particular instance since his right thumb was wet, I saw him slide to unlock using his left hand and enter the passcode to unlock his iPhone 6S. I was curious and asked him why. His response surprised me. He simply said that he only could unlock his iPhone using his right thumb print that he has set up and since that thumb could not be used at that time, he had to punch in his passcode.
If some of the readers of this post are equally intrigued like me, then I am glad! Yes there is way on the iPhone or any other iOS device that you can use multiple fingers on iOS's Touch ID and can use any one of those five fingers to unlock the device. Though I knew that this feature was not as ubiquitously popular as the single finger Touch ID, I did not realize how many people out there were not aware of this feature and were not taking advantage of this excellent feature (read along to appreciate this feature fully) on their iOS devices.
The above two images should be quiet familiar to any iOS user by now as Apple introduces the Touch ID feature and setup right away while setting up a new iOS installation. But what a lot of iOS users (apparently) never see is the image below, the Touch ID settings page (Settings > Touch ID). Here as you can see you can set up multiple fingers for using Touch ID with. Other than modifying Touch ID features like what authentications you would like Touch ID to perform and what lock screen features you want to protect using Touch ID, this screen helps you set up multiple fingers for Touch ID and believe me this is a life saver!
I have an infant and constantly end up in a situation where one of my hands is unusable. Using both hands' thumbs to unlock the iPhone is really useful in those situations. Also sometimes both your thumbs are indispensable and having your index fingers (or any other fingers) unlock your iOS devices comes in handy a lot of times. But more than all this, here is a bonus tip. You can actually have more than one person's finger setup for unlocking the same iOS device. I have my wife's finger print setup on my iPhone and my finger can unlock her iPhone as well. This is a crazy useful feature for families, be it unlocking your spouse's or your partner's iPhone or a family of more than two using the same iPad, where the parents and the kid(s) can all unlock the same iPad.
Finally here is another even more crazy tip on the same topic. Before I mention this, beware that I have not tried this myself and you can find more information on this here. But apparently you can even have more than five fingers setup for use with Touch ID. How is this possible with only five slots available in the Touch ID settings screen? I am not sure. But in short it appears as though Apple's Touch ID's resolution is insanely high and while setting up a finger for Touch ID purposes, if you deliberately trick the system by using two fingers instead, once successfully setup both the fingers can unlock the iOS device, though only one finger print slot will be used up.