If Telegram is open on another device, turn on 2-Step Verification, then go to Devices or Active Sessions and terminate the session on the stolen phone. Contact your phone provider to block the old SIM and issue a new one with your number. With no other device, get the new SIM first, then log in and end the old session.
Summary
Telegram identifies accounts by phone number, so whoever has the number can usually log in.
From another device, turn on 2-Step Verification and terminate the session on the stolen phone.
Ask your phone provider to block the old SIM and issue a new one with your number.
Without another logged-in device, get the new SIM first, then log in and end the old session.
Set a recovery email for your 2-Step Verification password and keep it secure.
A stolen phone is stressful enough without worrying about who can read your messages. With Telegram, the phone number is central: Telegram says the number is the only way it identifies a user, so whoever has the number has the account. That means acting quickly on both Telegram and your SIM. This guide follows Telegram's own FAQ for what to do, depending on whether you are still logged in on another device.
Last checked: 20 October 2026 against the Telegram FAQ.
Telegram says that the phone number is currently the only way it identifies a Telegram user, and that it does not collect additional information about you. As a result, it says it cannot help unless you have access either to the phone number or to Telegram itself on one of your devices (Telegram FAQ).
That makes two things urgent: cutting off the stolen phone's session, and making sure nobody else can use your number to log in.
Telegram says that once 2-Step Verification is on, you need both an SMS code and a password to log in. You can also set a recovery email address to help regain access if you forget the password, and Telegram says that recovery email should itself be protected with a strong password and two-step verification where possible (Telegram FAQ).
Telegram also supports passkeys, which let you log in with your device PIN, fingerprint or face scan instead of an SMS code. It says you can still request an SMS code with a passkey, so you should always keep an up-to-date phone number that you control.
Telegram says common thieves often throw away the SIM, then wipe and sell the device, so the risk to your data from ordinary theft may be limited. If you are worried about the data and cannot log the device out, it suggests wiping it remotely using Apple's or Android's own tools, which needs to have been set up in advance.
Telegram says Secret Chats are device-specific and are not part of the Telegram cloud. They can only be accessed on the device where they were created. Your normal cloud chats will be available when you log in on a new device, but Secret Chats from the stolen phone will not be.
Telegram says each phone number is a separate account. If you will not use the old number again, it says to go to Settings and change the number connected to your account to the new one, and warns that you must have access to your connected number or you risk losing the account. If you already have a different Telegram account on the new number, you need to delete that account before you can move yours onto it.
Telegram says it relies on volunteers for in-app support and that its official login help account on X is @smstelegram. It warns that it does not have other support accounts on social media, and that anyone on Facebook or another platform saying they are Telegram is not. Never share your login code or password with anyone.
Telegram ties accounts to phone numbers and says it cannot help unless you have the number or another logged-in device. Getting your number back through your provider is therefore essential. If your account has already been taken over, see our guide on a hacked Telegram account.
AwareXone helps people review account security and access through official routes. We are independent and not affiliated with Telegram, the work is best-effort, and Telegram makes the final decision. Read more about our account security support.
Can Telegram lock my account if my phone is stolen?
Telegram says the phone number is the only way it identifies users, so it cannot help unless you have the number or Telegram on another device.
How do I log the stolen phone out of Telegram?
From another device, go to Settings, then Devices or Active Sessions, and terminate the session on the old phone.
Will I lose my chats?
Cloud chats are available when you log in again. Telegram says Secret Chats are device-specific and only exist on the device where they were created.
Does 2-Step Verification stop someone with my SIM?
Telegram says that with 2-Step Verification on, logging in needs both the SMS code and your password, so the number alone is not enough.