In the MAX messenger, linking to a phone number is the foundation of everything: account, messaging, notifications from banks and government services. But what if the number belongs to someone else? The question is not theoretical: some people try this intentionally, while others accidentally enter the wrong number. Let’s break down what happens in each scenario.

Is it worth trying to log in with someone else’s number in MAX?
Can You Register in MAX Using Someone Else’s Number
Technically, the system does not verify whether the specified phone number in MAX is yours. It sends an SMS with a code to the entered number and waits for that code. If you have access to that number and received the code — registration will go through. If you don’t have access — the code won’t arrive, and nothing will happen.
This means the following: registering in the MAX app under someone else’s number without physical access to it or the SIM card is impossible. There is no workaround through guessing or brute-forcing codes — the system blocks such attempts. MAX on Android uses a standard SMS verification mechanism, which works exactly this way in all messengers.
What Happens to a Number in MAX If Another Person Used It
When someone enters another person’s number in MAX for registration, the owner of that number immediately receives an SMS with a confirmation code. This is the first signal: someone is trying to register with your number.

Breaking down the consequences for someone else’s account
What happens next depends on the situation. If the number’s owner already has a MAX account, they receive a notification about a login attempt from a new device and can immediately block that session. If there is no account — the owner can register at any time and gain full control over that number, kicking out whoever registered earlier.
What Happens to an Account Created with Someone Else’s Number
Let’s say access to someone else’s number was obtained — someone grabbed the phone for a minute, saw the code. The other person’s number in MAX made it possible to create an account. What’s next?
Such a profile in MAX is fundamentally vulnerable. Access to a MAX account is always restored via the phone number. This means: the real owner of the number can request a code at any time, receive it on their phone, and gain full control over the account. Moreover, everything that was in that account (messages in MAX, contacts, history) will end up with them.
Consequences of Using Someone Else’s Number in MAX
Using someone else’s phone number in MAX for registration is not a harmless technical trick. In the context of Russian legislation, this carries real risks.

And now the legal side of the issue
Through the MAX messenger, notifications from government services, confirmation codes from banks, and official messages from government agencies are received. Registering with someone else’s number to intercept such messages can be classified as unauthorized access to legally protected information under Article 272 of the Criminal Code of the Russian Federation. This is a criminal offense punishable by up to two years of imprisonment in its basic form, not an administrative fine.
Even without malicious intent (just to “take a look”), such actions leave traces: IP addresses, login times, device information. The MAX app logs sessions, and if necessary, this data can be requested.
How to Protect Your Number in MAX
The good news: without access to your SIM card, it is impossible to register with your number. But if someone could have taken your phone — it’s worth checking active sessions:
- Open MAX on Android and go to “Profile.”
- Go to “Settings — Devices.”
- Check the list of devices (an unfamiliar device or unfamiliar city should raise concerns).
- Press “Terminate all other sessions” if anything looks suspicious.

Here you can terminate active sessions
An additional measure: hide your phone number in MAX — there is a setting for number visibility to other users. A hidden number reduces the risk of your number ending up with strangers.