iCloud: Lock and track your device using Lost Mode in Find My iPhone
You can turn on Lost Mode to lock your iOS device, Apple Watch, or Mac so that others can’t access your personal information. Lost Mode also tracks any changes to the location of your iOS device or Apple Watch. If you can’t find your device, turn on Lost Mode right away using Find My iPhone on iCloud.com. If you have Family Sharing set up, you can turn on Lost Mode for family members’ devices, too. See the Apple Support article If your iPhone, iPad, or iPod touch is lost or stolen.
When your device is in Lost Mode:
You can display a custom message on the screen. For example, you may want to indicate that the device is lost or how to contact you.
Your device doesn’t display alerts or play a sound when you receive messages or notifications, or if any alarms go off. Your device can still receive phone calls and FaceTime calls.
Apple Pay is disabled for your device. Any credit or debit cards set up for Apple Pay, student ID cards, and Express Transit cards are suspended for your device. Apple Pay and student ID cards are suspended even if your device is offline. Express Transit cards are suspended the next time your device goes online. You can resume using suspended cards on your device after you unlock it and sign in to iCloud. See the Apple Support article Manage the cards that you use with Apple Pay.
Lost Mode requires an iOS device that meets the minimum system requirements listed in the Apple Support article System requirements for iCloud. With Apple Watch, you must have watchOS 3 or later installed to use Lost Mode.
You can lock a Mac or an iOS 5 device, but you can’t track it. If you lock a Mac, you can’t locate it if it’s not near a previously used Wi-Fi network, and you can’t change the passcode remotely, unlock it, or erase it.
Turn on Lost Mode or lock a device
Click All Devices, then select the device you want to put into Lost Mode or lock.
Click Lost Mode or Lock.
Follow the onscreen instructions, keeping the following in mind:
Passcode: If your iOS device or Apple Watch has a passcode, it’s required to unlock the device. Otherwise, you’re asked to create a passcode now. If you’re locking a Mac, you must create a numerical passcode, even if you already have a password set up on your Mac. This passcode is distinct from your password and is only used when you lock your Mac with Find My iPhone.
Family Sharing: If you’re trying to place a family member’s iOS device in Lost Mode and the device doesn’t have a passcode set, you must enter that person’s Apple ID password on this computer. If you’re trying to lock a family member’s Mac, you must enter that person’s Apple ID password on this computer.
Contact information: If you’re asked to enter a phone number, enter a number where you can be reached. If you’re asked to enter a message, you may want to indicate that the device is lost or how to contact you. The number and message appear on the device’s Lock screen.
Note: If you forget the passcode, or if you set an EFI firmware password on your Mac before it was lost, then lock it and later find it, you may need to take it to an authorized repair center to unlock it.
Track your device in Lost Mode
If you use Lost Mode, when tracking begins you see your device’s current location, as well as any changes in its location on the map.
Note: You can’t use Lost Mode to track a Mac or an iOS 5 device.
If your device is online when you put it in Lost Mode or lock it, it locks and tracking begins (if applicable). If Location Services is turned off on the device, it’s temporarily turned on to track your device’s location. A confirmation email is sent to your Apple ID email address.
If your device is offline, the passcode lock and tracking (if applicable) take effect the next time it’s online.
Turn off Lost Mode or change your contact info
You can turn off Lost Mode or unlock your device by entering the passcode on the device. For a Mac, use the numeric passcode you set up when you locked your Mac.
For Apple Watch or an iOS device, you can also follow the steps below to change the contact information displayed on your lost device or turn off Lost Mode.
Note: If you had any cards suspended when you put your device in Lost Mode (credit or debit cards for Apple Pay, or student ID cards or Express Transit cards), when you turn off Lost Mode and sign back in to iCloud, you can use them again.
Click All Devices, then select the device that’s in Lost Mode.
Click Lost Mode, then do either of the following:
Change information: Change the information, then click Done.
Turn off Lost Mode: Click Stop Lost Mode, then click Stop Lost Mode again.
Recover the passcode to unlock your Mac
Click All Devices, then select the Mac that’s locked.
Click Unlock, then follow the onscreen instructions to verify your identity with your Apple ID password.
Once you have your passcode, enter it on your Mac.
You can also use the Find My iPhone app on an iOS device to locate your missing device. For more information, open the Find My iPhone app, tap Help, then go to “Use Lost Mode.”
If you can’t use Lost Mode because Find My iPhone isn’t set up on your lost device, see the Apple Support article If your iPhone, iPad, or iPod touch is lost or stolen.