Lost Your Phone? How to Find, Lock, or Erase It

The first ten minutes: find, lock, erase

Before anything else, call your own number from another phone. It might be under the sofa cushion. Retrace your steps for a minute, then stop guessing and use the tools.

Every platform follows the same three-step logic. You try to find the phone. If you can’t get it back quickly, you lock it. Only if it is really gone do you erase it.

Lock early, erase late. Locking is reversible. Erasing is not.

Safety first. If the map shows your phone in someone else’s home or a street you don’t know, don’t go and get it yourself. Samsung says the same in its own help pages. Give the location to the police instead.

Set it up before you lose it

These tools only work if they were switched on before the phone disappeared. Take two minutes today to check them.

On an iPhone

Open Settings, tap your name, then Find My, then Find My iPhone. Turn on Find My network so the phone can be located even when it is offline. Turn on Send Last Location too, so it reports its position when the battery is about to die.

Then search Settings for Stolen Device Protection. It has been on by default since iOS 26.4. Away from familiar places like home or work, sensitive changes need Face ID or Touch ID, and some of them add a one-hour Security Delay. That delay gives you time to mark the phone as lost.

On an Android phone

Find Hub (the new name of Find My Device) switches on automatically when you add a Google account. Check that the phone is allowed to be located, and that offline finding is on. Offline finding uses nearby Android devices, with end-to-end encrypted location, and needs Android 9 or newer.

On supported phones, also look for Theft Detection Lock and Offline Device Lock in Settings. Search for “theft protection”. The first locks the screen after a grab-and-run. The second locks the phone if a thief cuts its internet connection.

Two habits help as well. Use a real passcode, not 1234, and write down your phone’s IMEI number (the serial number of its modem). You will need it for the carrier and the police.

How to find a lost iPhone

You have two options. Use the Find My app on another Apple device, or any browser at iCloud.com/find. Sign in with your Apple Account. Apple says you don’t need a verification code there, which matters if your trusted phone is the one that is missing.

Select your iPhone in the device list. If it is online, you see it on the map. If it is offline, you may see the last known location, or a fresh one if another Apple device nearby picked it up. Tap Play Sound if you think it is close.

One limit to remember: if Find My was off before the phone went missing, it won’t appear on the map and you can’t lock or erase it remotely.

Lock an iPhone with Mark as Lost

If you can’t find it within a few minutes, mark it as lost. In the Find My app, open Devices, pick your iPhone, scroll down and tap Mark As Lost, then Activate. On iCloud.com the same function is called Lost Mode.

Apple asks for a phone number and a short message. Both appear on the lock screen. The iPhone locks with its passcode, and Apple Pay stops working on it. Apple also sends a confirmation email to your Apple Account address.

With Stolen Device Protection on, turning Lost Mode off away from home needs Face ID or Touch ID. That stops a thief who knows your passcode from simply switching it off.

Find and secure a lost Android phone

Go to android.com/find on any browser, or open the Find Hub app on another Android phone. On a friend’s phone you can use guest mode, so you don’t need to sign in to their account. Sign in with the Google account used on the lost phone.

Pick the device. You can play a sound, which rings for several minutes at full volume even if the phone is on silent. If that fails, tap Secure device (in the app it may say Mark as lost). Add a message and a phone number for the lock screen. Securing the phone locks it and signs your Google account out of it.

If you don’t remember your Google password, you can still try android.com/lock. It lets you lock the phone using only its phone number, on supported phones with a screen lock and a verified number.

Samsung Galaxy: Samsung Find

Galaxy phones add their own service. It is called Samsung Find (SmartThings Find), and it replaced Find My Mobile. It needs a Samsung account on the phone, and you use it at smartthingsfind.samsung.com or in the SmartThings app on another Galaxy device.

You get Lock, which sets a PIN, shows a message and phone number, and blocks Samsung Pay and Samsung Wallet. You also get Erase data, and Extend battery life, which helps if the phone is nearly empty. Running Erase data also removes the Samsung account from the phone, so Samsung tracking stops afterwards.

On a Galaxy you can use Find Hub and Samsung Find together. Lock with whichever one answers first.

Lock or erase: which one, and when

Locking keeps your options open. The phone stays tracked, you can update the message, and if someone returns it you unlock it and carry on. Modern iPhones and Android phones encrypt their storage by default, so a strong passcode already protects your data well.

Erase when you are sure the phone is gone, when it holds sensitive work or personal data, or when a thief is clearly trying to get in. An erase command waits until the phone is online, so send it early. Afterwards, the phone stays tied to your account. An iPhone keeps Activation Lock, so don’t remove it from Find My after erasing. An Android phone needs the original Google account details to be set up again.

Your backup is what makes erasing painless. If you back up to iCloud or Google, you restore everything on the new phone in minutes.

Protect your accounts, SIM and money

A locked phone protects the phone. You still need to protect everything it can reach. Work through this list in order.

1. Call your carrier

Ask them to suspend the SIM and block the phone by its IMEI. This stops calls on your bill and stops thieves receiving text codes. Ask for a replacement SIM with the same number afterwards.

2. Change the key passwords

Start with your Apple Account or Google account, then your email, banking, social media and password manager. Remove the lost phone from your account’s device list. Use backup codes or a passkey if your authenticator app lived on that phone.

3. Check your cards

Lost Mode and Samsung’s Lock suspend phone payments, but call your bank if you saved cards in a wallet app or bank apps. Watch your statements for a few weeks.

4. Report it

File a police report. Insurers and carriers often ask for the report number, and you can add the IMEI to it.

Beware of “we found your phone” scams

After you mark a phone as lost, scammers may send a text or email that looks official. It says your phone was found and asks you to sign in to see its location. The link leads to a fake page that steals your Apple Account or Google password.

Never tap links in such messages. Type iCloud.com/find or android.com/find yourself. Never share verification codes, and remember that nobody needs your password to “unlock” your phone.