Released on September 19, 2014, this 4.7" screen iPhone is the smaller version of the iPhone 6 Plus.

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How do I tell which home button goes to which phone?

I made a critical mistake, I accidentally swapped the home buttons of several devices. I also have some spares which may have been confused. Is there a surefire way to tell which home button goes to which phone? Maybe a serial number that matches, or something? And if there is nothing like this, is there at least something to narrow the phones that a home button could belong to down? Thanks for any help, this will cost me a couple hundred bucks if I can't remedy it.

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If the iPhones turn on, and you have access codes, all you need to do is:

- Turn off iPhone;

- Disconnect battery;

- Install home button;

- Boot iPhone;

- Input code;

- Go to Settings>Touch ID and Passcode> Add Fingerprint. If the buttons scans your fingerprint, you have a matching home button. If not, rinse and repeat.

Besides, if the iPhone is turned on without its matching home button, a pop up message will appear "Unable to Activate Touch ID on this Device" or something similar once you unlock the iPhone.

- It is critical to disconnect the battery before replacing the home button, reconnecting the battery last, and turning on the iPhone after the button is attached. If you replace the button while iPhone is powered on, it will not be recognized and will always say "Unable to Activate..." even if it is the matching Home Button. That and the risk of frying components on the boards by working with the battery connected.

- If the iPhones were already restored with non-matching home buttons, then you have to restore with every new home button that you test.

I know of no other way to match home buttons to their iPhone housing.

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Not that I know of...

I presume you want to recover Touch ID functionality. I looked at an original and aftermarket Home Button and there's not much difference visually. The only difference I saw was that you can see some components in white epoxy inside the "button" whereas the aftermarket has a white screen hiding those components. I can't guarantee you will see the same thing though as it might be supplier dependent.

You will have to move them around, eliminating options as you go along by testing for Touch ID functionality.

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No there is nothing obvious from the outside.

If you are sure that you did not lose or break any of the phones and buttons, it becomes a mathematical problem, how to test N devices and N+n home buttons the least times and find out the matching buttons. If you have time just go through every one of them.

Each test has to be done with a software recovery, losing all data not backed up, force upgrade to the latest iOS and requires customers to unlock their devices on icloud.com. After that you can try adding fingerprints and if it proceeds successfully, you've found the matching ones.

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Garrison Bates will be eternally grateful.
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