Tech for Beginners Part 56: Lost or Stolen Phone? How to Find, Lock, Erase and Block It

The sinking feeling of reaching into your pocket and finding no phone is something many of us know. Phones are lost in autos, left behind at restaurants, or snatched on crowded trains and at festivals. Today a phone holds far more than contacts: UPI apps, bank accounts, WhatsApp chats, photos, email and Aadhaar copies. What you do in the first hour matters a lot. This is Part 56 of our Tech for Beginners series. Today we will learn how to prepare your phone in advance, how to locate, lock and erase it with Google's and Apple's tools, how to block the SIM and the phone's IMEI through Sanchar Saathi's CEIR service, and how to secure UPI, banking and WhatsApp straight away.

We introduced Sanchar Saathi in Part 28. Securing payments draws on Part 23 on UPI safety and Part 24 on cards and net banking. Your backups from Part 34 mean that even if the phone is gone for good, your photos and chats need not be.

A note on changes: Google renamed its Find My Device tool to Find Hub in 2025, and it continues to redesign it, and Apple updates Find My regularly. Sanchar Saathi forms and requirements can also change. The steps below were checked against official pages at the time of writing; always follow the latest instructions on the official websites.

Part A: Prepare today, before anything happens

1. Set a strong screen lock: a 6-digit PIN or password, plus fingerprint or face unlock. Avoid simple patterns like an "L" or "Z".
2. Turn on phone finding:
   • Android: look for Find Hub (called Find My Device on older phones) under Settings > Security & privacy or Settings > Google, turn it on, and keep location on. Samsung phones also offer SmartThings Find.
   • iPhone: Settings > [your name] > Find My > Find My iPhone, and turn on Find My network and Send Last Location.
3. Turn on theft protection: recent Android versions offer Theft protection features such as Theft Detection Lock, under Google security settings. iPhones offer Stolen Device Protection under Face ID & Passcode. Availability depends on your phone and software version.
4. Note your IMEI: dial *#06# to see it. Dual-SIM phones have two IMEIs. Write them down or keep the phone box and bill safely.
5. Set a SIM PIN so a thief cannot use your SIM in another phone to receive OTPs. Note the PUK code from the SIM card holder or your operator first.
6. Hide notification content on the lock screen, so OTPs are not visible without unlocking.
7. Back up photos, contacts and WhatsApp chats regularly.
8. Know your Google or Apple account password and save your bank's official customer care number somewhere other than your phone, such as a small card in your wallet.

Part B: The first hour after losing your phone

Stay calm and follow this order:

1. Call your number from another phone. If someone honest found it, they may answer.
2. Locate it using Google or Apple tools (Part C).
3. Lock it and show a message with an alternate contact number.
4. If it seems stolen, do not try to recover it yourself from a stranger. Go to the police.
5. Block your SIM with your operator (Part D).
6. Secure payments and accounts (Part F).
7. File a police complaint and block the IMEI on CEIR (Part E).

Part C: Find, lock and erase

Android

1. On a computer or another phone, open android.com/find, or the Find Hub app on a family member's phone (you can sign in as a guest), and sign in with your Google account.
2. Select your phone to see its location on the map, if it is switched on and connected.
3. Play sound: rings the phone at full volume for five minutes, even if it is on silent. Useful if it is somewhere in the house.
4. Secure device: locks the phone and shows a message and contact number on the screen.
5. Factory reset device: erases everything remotely. After this, you can no longer locate the phone, so use it only when you believe the phone will not be recovered.

iPhone

1. Open icloud.com/find on a computer, or the Find My app on another Apple device, and sign in with your Apple Account.
2. Choose your iPhone to see its location.
3. Play Sound to find it nearby.
4. Mark As Lost (Lost Mode) locks the iPhone, shows your message and number, and suspends Apple Pay.
5. Erase This Device wipes it remotely. Activation Lock means a thief still cannot set it up without your Apple Account password.

What if the phone is switched off?

You may see its last known location. Some newer phones can be found while offline or switched off through crowd-sourced networks, depending on model and settings. Any lock or erase command you send will take effect when the phone next connects.

Safety note: if the map shows the phone in an unknown place, share the location with the police instead of going there yourself.

Part D: Block your SIM

1. Call your operator's customer care from another phone, or visit their store, and ask them to block your SIM. This stops OTPs and calls reaching the thief.
2. Get a replacement SIM with the same number from the operator's store with your ID proof. You will need this active number for the CEIR blocking form, for banking apps and for WhatsApp.

Some operators let you block a SIM through their app or website using your account login. Use only official channels.

Part E: File a police complaint and block the IMEI on CEIR

The Central Equipment Identity Register (CEIR) is the Department of Telecommunications' system for blocking lost or stolen phones across all mobile networks in India. It is available through sancharsaathi.gov.in, ceir.gov.in and the Sanchar Saathi app.

What you need

• A police complaint (FIR or lost report) and its number. Many states let you file a lost-article report online through the state police website.
• Your re-issued SIM, active, for OTP verification.
• The phone's IMEI number(s), from the box or bill.
• Identity proof. If you use Aadhaar, the form asks for a masked copy.
• The purchase invoice, if you have it (optional according to the official manual).

Steps

1. Go to Sanchar Saathi and choose Block your lost / stolen mobile handset.
2. Fill in the phone details, loss date and place, police station and complaint number, and upload the complaint copy and ID.
3. Enter the OTP sent to your re-issued SIM and submit.
4. Save the Request ID that is generated. You will need it to check status or unblock the phone.

Once blocked, the phone cannot be used on Indian mobile networks, which makes it less valuable to thieves and can help police trace it.

If you find the phone

Use Unblock found mobile handset on Sanchar Saathi with your Request ID and complaint details. There is also a Forgot request ID option.

Part F: Secure UPI, banking and WhatsApp right away

UPI and banking

• Call your bank's official customer care number and ask them to block UPI and mobile banking on the lost phone, and to block any cards stored in wallets.
• Check your account statement for unknown transactions.
• If money has been taken, call 1930 immediately and report at cybercrime.gov.in.
• When you get a new phone, re-register UPI apps with your replacement SIM and set a new UPI PIN if advised.

Email and Google or Apple account

• Change your Google or Apple Account password from another device.
• Review signed-in devices and remove the lost phone.
• Change passwords for important apps, especially if your screen lock was weak.

WhatsApp

• Once you have your replacement SIM, install WhatsApp on another phone and register with your number. This logs out the lost phone.
• If you cannot get a replacement SIM quickly, WhatsApp's help pages have described emailing its support with the phrase "Lost/Stolen: Please deactivate my account" and your number in international format (+91 followed by your number). This process has changed in the past, so check the latest instructions in the WhatsApp Help Centre first.
• Tell friends and family that your phone was lost, so they ignore any money requests from your account.

Part G: Helping an elder who has lost a phone

Elderly parents are often confused and upset after losing a phone, and fraudsters sometimes call pretending to "help recover" it. Keep their IMEI numbers, Google or Apple Account details and bank helpline numbers in a safe place at home. If their phone goes missing, help them follow the steps above in order, and remind them that genuine police or telecom staff will not ask for OTPs or payments over the phone.

Frequently asked questions

Can police track my phone with the IMEI?

Blocking through CEIR helps authorities trace a phone if someone uses it with a new SIM. Recovery is not guaranteed, but many phones are recovered this way each year, according to government updates.

Should I erase my phone immediately?

Lock it first and try locating it. Erase when you believe it will not be recovered or if it holds very sensitive data, because after erasing you may not be able to locate it.

The thief switched off my phone. Is everything lost?

No. Your backups keep your data safe, and blocking the SIM, accounts and IMEI protects you from misuse.

What is next

Try this today: dial *#06# and save your IMEI somewhere safe, turn on Find My Device or Find My, and set a SIM PIN. In the next part of Tech for Beginners, we will look at digital wellbeing: screen time, focus modes and better sleep.