This article originally appeared in TidBITS on 2016-08-19 at 2:31 p.m.
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Setting Up and Using Find My iPhone

by Josh Centers

Once a selling point for Apple’s premium MobileMe service, Find My iPhone went free with the advent of iCloud and is now an essential tool in protecting the privacy of your digital life.

Find My iPhone isn’t limited to the iPhone — it’s also available for the iPad, iPod touch, Apple Watch, and Mac, and the name changes for each platform. A little confusingly, Find My iPhone is both an iCloud-based service controlled by a setting on your device and an app for iOS and iCloud.

As its name implies, Find My iPhone helps you find your iPhone by displaying its GPS location on a map. You can also use Find My iPhone to play a sound on your device (handy for finding a misplaced iPhone around the house) or display a status message (perhaps to offer a reward for a lost iPad). You can also use Find My iPhone to lock or wipe a device remotely.

Even more importantly, Find My iPhone enables Activation Lock, which prevents a thief from activating a stolen iPhone with a cellular carrier. It also prevents anyone from disabling Find My iPhone or erasing the device, rendering a stolen device useless. Activation Lock is credited with worldwide drops in iPhone thefts [1] of up to 50 percent! For that reason alone, you should keep Find My iPhone enabled at all times unless you plan to sell your phone or take it to Apple for service. For more on Activation Lock, see “What You Need to Know about Activation Lock [2]” (8 October 2014).

New iPhones are coming soon, so now is a good time to understand how to activate and use Find My iPhone if you aren’t already doing so, or turn it off if you plan to sell your existing iPhone.

Enabling Find My… -- Both iOS and the Mac prompt you to enable Find My… during setup, but if you skipped it for some reason, here’s how to set it up.

In iOS, go to Settings > iCloud > Find My iPhone, and turn on Find My iPhone (or Find My iPad). It’s that simple, assuming that you’re already signed into iCloud. You should also enable Send Last Location, which sends Apple the device’s last known location when the battery is critically low. This way, even if your iPhone dies before you can find it, you’ll at least have a lead on where it is.

As long as Find My iPhone is enabled, Activation Lock is also enabled, making the device useless to anyone who doesn’t know your Apple ID and password. If you have an Apple Watch running watchOS 2 or later, enabling Find My iPhone also triggers Activation Lock on any paired Apple Watches [3].

Turning off Find My iPhone in Settings > iCloud > Find My iPhone is a bit more involved than turning it on because you have to enter your Apple ID password to do so. You will also receive an email informing you that Find My iPhone has been disabled.

Be sure to disable Find My iPhone if you sell or give your phone to someone else, or if you take the device to Apple for service. Apple won’t repair a device that has Find My iPhone enabled. Of course, if you’re going to pass on an iPhone to another person, be sure to clean it off first with Settings > General > Reset > Erase All Content and Settings.

To enable Find My Mac, go to System Preferences > iCloud, select Find My Mac, and allow Find My Mac to use your Mac’s location when prompted. Wi-Fi must be on, since comparing accessible Wi-Fi networks to Apple’s database that ties Wi-Fi networks to locations is the only way a Mac can determine its location. As in iOS, you must enter your Apple ID password to disable Find My Mac.

Also be sure to set a firmware password. As Adam Engst explained in “Disable Find My Mac by Resetting NVRAM [4]” (22 July 2016), a thief can otherwise easily disable Find My Mac with a simple NVRAM reset.

Using the Find My… Apps -- Using the Find My iPhone app on an iOS device is straightforward. The app displays a map showing your devices, along with a list of your devices. If you belong to a Family Sharing group, you should also see family members’ device locations.

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Tap an iOS device or Apple Watch on the map to see the following options. If you don’t see them, tap Actions:

In the event that you manage to recover the device, you can restore the device using an iCloud backup. You have been backing up to iCloud (via Settings > iCloud > Backup) and/or iTunes all along, haven’t you?

Should your device be unrecoverable, and if it has a cellular plan, be sure to contact your carrier and have service cut off or transferred to another device. However, if you’re on a contact or payment plan, you may still be on the hook for the monthly bill.

Tracking a Mac offers slightly different options: Play Sound, Lock (instead of Lost Mode), and Erase Mac. Lock differs from the iOS-specific Lost Mode in that you cannot erase a locked Mac. You set a PIN and confirm it, and then enter an optional message.

Once you lock the Mac remotely, it reboots into a special locked mode. To unlock it, you have to enter the PIN you set, after which the Mac reboots into normal operation. You cannot unlock a Mac remotely with the Find My iPhone app.

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While there isn’t a Find My iPhone app for the Mac, offers a Web app that’s almost as good. The chief differences from the iOS app are that you access your device list from a menu, and the Web app doesn’t provide directions to the device.

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Now that you know the ins and outs of Find My iPhone and Find My Mac, there’s no excuse not to use them! They should be enabled on all of your devices until the time comes to get rid of them or have them serviced.