Use Lost Mode in Find My iPhone on iCloud.com
Lost Mode lets you lock your iPhone, iPad, iPod touch, Mac or Apple Watch so that others cannot access your personal information. You can turn on Lost Mode in Find My iPhone on iCloud.com.
Lost Mode requires a device that meets the minimum system requirements listed in the Apple Support article System requirements for iCloud.
To sign in to Find My iPhone, go to icloud.com/find.
What happens when you use Lost Mode or lock a lost device?
A confirmation email is sent to your Apple ID email address.
You can display a custom message on your device screen. For example, you may want to indicate that the device is lost or how to contact you.
Your device does not 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 Travel cards are suspended for your device. Apple Pay and student ID cards are suspended even if your device is offline. Express Travel 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 with your Apple ID. See the Apple Support article Manage the cards that you use with Apple Pay.
For an iPhone, iPad, iPod touch or Apple Watch, you see your device’s current location on the map, as well as any changes in its location. If Location Services is turned off on the device, it is temporarily turned on to track your device’s location.
Turn on Lost Mode or lock a device
In Find My iPhone on iCloud.com, tap the device you want to put into Lost Mode or lock in the Devices list.
Tap Lost Mode or Lock.
Follow the onscreen instructions, keeping the following in mind:
Passcode: if your iPhone, iPad, iPod touch or Apple Watch has a passcode, it is required to unlock the device. Otherwise, you are asked to create a passcode now. If you are 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 are trying to place a family member’s iPhone, iPad or iPod touch in Lost Mode and the device does not have a passcode set, you must enter that person’s Apple ID password on this device. If you are trying to lock a family member’s Mac, you must enter that person’s Apple ID password on this device.
Contact information: if you are asked to enter a phone number, enter a number where you can be reached. If you are 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 locked 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 authorised repair centre to unlock it.
To return to the Devices list, tap .
Change your contact information on a lost device
After you mark your iPhone, iPad, iPod touch or Apple Watch as lost, you can update your contact information.
In Find My iPhone on iCloud.com, tap the iPhone, iPad, iPod touch or Apple Watch that is in Lost Mode in the Devices list.
Tap Lost Mode, change the information, then tap Done.
To return to the Devices list, tap .
Turn off Lost Mode on an iPhone, iPad, iPod touch or Apple Watch
When you find your lost device, do either of the following to turn off Lost Mode:
Enter your passcode on the device.
In Find My iPhone on iCloud.com, tap the device that is in Lost Mode in the Devices list. Tap Lost Mode, tap Turn Off Lost Mode, then tap Stop 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.
Recover the passcode and unlock your Mac
In Find My iPhone on iCloud.com, tap the Mac that is locked in the Devices list.
Tap 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.
If you cannot use Lost Mode because Find My iPhone is not set up on your lost device, see the Apple Support article If your iPhone, iPad or iPod touch is lost or stolen.