Technology

Block Lost Mobile Phone in 2026: 9 Easy Steps on Sanchar Saathi (CEIR)

admin September 25, 2026

Losing your smartphone is stressful. Along with the cost of the device, you worry about your photos, bank apps, social media and personal data falling into the wrong hands. The good news is that in India you can block lost mobile phone devices for free using the government’s Sanchar Saathi portal, which is connected to the Central Equipment Identity Register (CEIR).

Once you block lost mobile phone handsets through CEIR, the device cannot be used on any Indian mobile network, even if someone inserts a new SIM card. This makes the stolen phone almost useless to thieves and also helps police trace it.

In this detailed guide, you will learn the complete process to block lost mobile phone devices in 2026, the documents you need, how to find your IMEI number, how to track your request, and how to unblock the phone once you get it back.

What Is Sanchar Saathi and CEIR?

Sanchar Saathi is a citizen-centric portal and mobile app launched by the Department of Telecommunications (DoT), Government of India. It offers several services to protect mobile users, including blocking lost or stolen phones, checking mobile connections registered in your name, and verifying whether a handset is genuine.

CEIR (Central Equipment Identity Register) is the central database of IMEI numbers of mobile devices used in India. It is connected with all telecom operators such as Jio, Airtel, Vi and BSNL. When you block lost mobile phone IMEI numbers in CEIR, every network denies service to that handset.

In simple words, Sanchar Saathi is the website or app you use, and CEIR is the system that actually blocks the phone across networks.

Why You Should Block Lost Mobile Phone Immediately

Many people wait for days hoping the phone will turn up. That delay can be risky. Here’s why you should act quickly:

Stops misuse of your device: thieves cannot use the handset with any SIM card on Indian networks.
Protects your identity: it reduces the chance of your phone being used for fraud or crime in your name.
Reduces resale value for thieves: a blocked phone is hard to sell, which discourages theft.
Helps police trace the phone: if someone tries to use the device with a new SIM, the system can alert the police.
Completely free: there is no fee to block lost mobile phone devices through Sanchar Saathi.

Documents and Details Required

Before you start, collect the following details. Keeping them ready will help you finish the process in about 10 minutes.

Requirement	Details
Police complaint	Complaint number and police station name (FIR or online lost report)
IMEI number	15-digit IMEI of the lost phone (two IMEIs for dual-SIM phones)
Mobile number	The number that was used in the lost phone
Alternate mobile number	For receiving OTP and updates
Identity proof	Aadhaar, PAN, passport, voter ID or driving licence
Purchase invoice	Recommended, as proof of ownership
Device details	Brand, model and date of loss

Tip: before you block lost mobile phone IMEI numbers, get a duplicate SIM for your lost number from your telecom operator. This keeps your number active, protects your bank OTPs and lets you receive verification messages.

How to Find the IMEI Number of a Lost Phone

IMEI (International Mobile Equipment Identity) is a unique number that identifies every mobile phone. You need it to block lost mobile phone devices in CEIR. If your phone is already lost, you can still find the IMEI in several ways:

Phone box: the IMEI is printed on a sticker on the original box.
Purchase invoice: most bills from shops and e-commerce sites mention the IMEI.
Google account (Android): sign in to your Google account on another device and open the devices section of your account settings, where many phones list the IMEI.
Apple ID (iPhone): sign in to your Apple account on another device, open the devices list and select your iPhone to see the IMEI.
Old screenshots or service records: check any repair bill or warranty card.

If you still have the phone (for example, before selling or gifting it), dial *#06# to see the IMEI instantly. It’s a good habit to save this number somewhere safe for every phone you own.

Step 1: File a Police Complaint

A police complaint is mandatory to block lost mobile phone devices through CEIR. You can:

Visit the nearest police station and file a complaint about the lost or stolen phone.
Or use your state police’s online “lost article” or e-FIR service, if available.

Keep the complaint number, police station name and a copy of the complaint (PDF or photo). You will need to upload it on the portal.

Step 2: Get a Duplicate SIM for Your Number

Visit your telecom operator’s store with your ID proof and request a replacement SIM for the lost number. This is important because:

Your bank and UPI apps send alerts to this number.
Sanchar Saathi may send an OTP to the lost number during the request.
You avoid missing important calls and messages.

Most operators issue a replacement SIM within a few hours. Note that outgoing SMS on a replaced SIM may be restricted for a short period for security reasons.

Step 3: Block Lost Mobile Phone on Sanchar Saathi

Now follow these steps to block lost mobile phone access through the official portal:

Visit the official Sanchar Saathi portal or open the Sanchar Saathi app.
Go to Citizen Centric Services and select Block Your Lost/Stolen Mobile.
Enter the mobile numbers used in the phone and the IMEI number(s).
Select the device brand and model, and upload the purchase invoice if you have it.
Enter the place, date, state, district and police station of the loss, along with the police complaint number.
Upload a copy of the police complaint.
Enter the owner’s name, address and identity proof details, and upload the ID proof.
Enter your email ID and an alternate mobile number to receive an OTP.
Accept the declaration and click Submit.

After submission, you receive a Request ID. Save it carefully. You need it to check the status and unblock the phone later.

What Happens After You Submit the Request?

Once you block lost mobile phone IMEI numbers, CEIR shares the details with all telecom operators. Usually, the handset is blocked within about 24 hours. After that:

The phone cannot make calls, send SMS or use mobile data on any Indian network.
If someone inserts a new SIM, the attempt is recorded, and the information can help police trace the device.
You receive updates on your registered contact details.

Blocking does not erase your data. To protect your personal information, also use remote tools such as Google Find My Device or Apple Find My, explained later in this guide.

How to Check the Status of Your Blocking Request

After you block lost mobile phone IMEI numbers, you can track your request at any time:

Visit the Sanchar Saathi portal or app.
Select Check Request Status under the lost/stolen mobile service.
Enter your Request ID.
View the current status of your request.

If the status doesn’t update for several days, contact your local police station or the DoT grievance support listed on the portal.

How to Unblock Your Phone After Recovery

If the police recover your phone or you find it yourself, you can easily unblock it:

Visit the Sanchar Saathi portal and open the lost/stolen mobile service.
Select Un-Block Found Mobile.
Enter your Request ID and the mobile number used during the request.
Select the reason for unblocking and verify with OTP.
Submit the request.

The phone usually starts working on networks again within about 24 hours of a successful unblock request. If your phone was recovered by police, you may need to complete formalities at the police station to collect it.

Other Useful Sanchar Saathi Services

Sanchar Saathi offers more than the option to block lost mobile phone devices. These services can help you stay safe:

Know Your Mobile Connections

This service shows all mobile numbers registered in your name. If you find a number you don’t use, you can report it as “Not my number” or “Not required”, and the operator will verify and disconnect it.

Know Your Mobile (KYM)

Before buying a second-hand phone, check whether its IMEI is genuine, blacklisted or duplicate. You can use the Sanchar Saathi app, or send KYM followed by the 15-digit IMEI by SMS to 14422.

Chakshu: Report Suspected Fraud Communication

You can report suspicious calls, SMS or WhatsApp messages, such as fake KYC updates, lottery offers or impersonation calls, through the Chakshu facility on the portal.

Report Incoming International Calls With Indian Numbers

If you receive a call that shows an Indian number but seems to be from abroad, you can report it so that authorities can take action against fraud networks.

Protect Your Data After Losing Your Phone

When you block lost mobile phone access on networks, the handset stops working with SIM cards, but your data may still be on the device. So after you block lost mobile phone access, take these steps as soon as possible:

Android: use Google Find My Device to locate, lock or erase your phone remotely.
iPhone: use Apple’s Find My service to mark the device as lost and erase it if needed.
Bank and UPI apps: call your bank’s customer care to block UPI and mobile banking on the lost device.
Email and social media: sign out of all devices from your Google, Microsoft, Facebook, Instagram and WhatsApp accounts, and change your login credentials.
WhatsApp: once you get a duplicate SIM, register WhatsApp on a new phone. This automatically logs out the old device.
Wallets and payment apps: contact the support team of each payment app to deactivate the account on the lost phone.

Common Mistakes to Avoid

Delaying the police complaint: without the complaint number, you cannot block lost mobile phone IMEI numbers on CEIR.
Entering the wrong IMEI: double-check each digit. A wrong IMEI may block someone else’s device or fail verification.
Forgetting the second IMEI: dual-SIM phones have two IMEI numbers. Enter both to fully block the device.
Losing the Request ID: save it in your email or notes app. Without it, unblocking becomes difficult.
Not getting a duplicate SIM: you may miss verification messages and bank alerts.
Trusting fake recovery agents: never pay anyone who promises to track your phone for a fee. The official service is free.

Tips to Prevent Phone Loss and Theft

Prevention is always better than cure. You may never need to block lost mobile phone devices if you follow these simple habits:

Save your IMEI numbers and purchase invoice in a secure cloud folder.
Always use a strong screen lock such as a PIN, pattern or fingerprint.
Keep Find My Device (Android) or Find My (iPhone) turned on.
Enable SIM card lock so thieves can’t easily use your SIM in another phone.
Avoid keeping your phone in back pockets or open bags in crowded places.
Turn on automatic backups for photos, contacts and important files.
Add an emergency contact to your lock screen, so an honest finder can return your phone.

Sanchar Saathi Portal vs Sanchar Saathi App

Feature	Portal (website)	Mobile app
Block lost/stolen mobile	Yes	Yes
Unblock found mobile	Yes	Yes
Check request status	Yes	Yes
Know your mobile connections	Yes	Yes
IMEI check (KYM)	Yes	Yes, with scan option
Report fraud (Chakshu)	Yes	Yes
Best for	Desktop users with documents ready	Quick access on your phone

Both options connect to the same CEIR system, so you can block lost mobile phone devices using whichever is more convenient.

For more tech safety guides, read our tips to increase phone battery life and how to download Aadhaar card safely from official sources. You can also explore more articles in our Technology section.

Lost vs Stolen Phone: What Should You Do First?

The steps are almost the same, but the order of priority changes slightly depending on the situation.

If you simply lost your phone

First, call your number from another phone. Someone honest may answer. Next, use Find My Device or Find My to see the last known location and play a sound. If the phone is still missing after a few hours, file a police complaint and block lost mobile phone access through Sanchar Saathi.

If your phone was stolen

Don’t try to recover it yourself, especially if you see its location on a map. Report the theft to the police immediately and share the location details with them. Then block the SIM, get a duplicate SIM, secure your bank and UPI apps, and submit the CEIR blocking request.

How Police Use CEIR to Trace Stolen Phones

When a blocked handset is used with a new SIM card anywhere in India, the CEIR system records the attempt and the details can be shared with the police station linked to your complaint. This is how thousands of lost and stolen phones have been traced and returned to their owners across states. So even if your phone doesn’t turn up immediately, blocking it keeps the chances of recovery alive for months.

Quick Recap: How to Block Lost Mobile Phone in 5 Minutes

If you are in a hurry, here is the short version of how to block lost mobile phone devices in India:

File a police complaint and note the complaint number.
Get a duplicate SIM for your lost number from your telecom operator.
Keep the IMEI number, ID proof and purchase invoice ready.
Open Sanchar Saathi and choose the option to block lost mobile phone handsets.
Fill in the details, upload documents, verify with OTP and save the Request ID.

That’s all it takes to block lost mobile phone access across every network in India. Keep the Request ID safe, because you will need it to unblock the phone if it is found.

Frequently Asked Questions

Is it free to block lost mobile phone devices on Sanchar Saathi?

Yes. The service is completely free. Never pay any agent or website that claims to block or track your phone for money.

Is a police complaint necessary to block a lost phone?

Yes. You need a police complaint number and a copy of the complaint to submit a blocking request on Sanchar Saathi.

How long does it take to block a lost phone through CEIR?

In most cases, the phone is blocked across all Indian networks within about 24 hours of submitting the request.

Can a blocked phone still be used with Wi-Fi?

A blocked phone cannot use mobile networks. It may still connect to Wi-Fi, so also lock or erase it using Find My Device or Find My.

Can I unblock my phone after I get it back?

Yes. Use the “Un-Block Found Mobile” option with your Request ID, and the phone will work again on networks.

Can I block a phone if I don’t know the IMEI number?

You need the IMEI number. Check the phone box, purchase invoice, or your Google or Apple account to find it.

Conclusion

Losing a phone is upsetting, but acting quickly can prevent misuse and improve your chances of getting it back. File a police complaint, get a duplicate SIM, and then block lost mobile phone IMEI numbers through the official Sanchar Saathi portal or app. Protect your data with remote lock and erase tools, and save your Request ID so you can unblock the phone if it’s found. With these simple steps, you stay in control even when your phone is not.