SoftwareNov 6, 2026, 8:48 AM UTC·2 min read

Max Messenger to Join Russia's GIS KSIM Number-Check System

Russia's Digital Ministry plans to connect the Max messenger to the GIS KSIM telecom monitoring system so it can check whether users' phone numbers are still active.

Smartphone showing a messenger app next to a SIM card, symbolizing phone number verification. — Image: Хабр

The Max messenger is set to be connected to GIS KSIM, the state information system that monitors how telecom operators meet their obligations. The goal is to verify that the phone numbers tied to user accounts are still valid, according to Russia's Ministry of Digital Development.

The ministry says the link will let Max check the status of numbers used in the app and take into account the termination of telecom service contracts. In practice, the messenger will be able to spot numbers that are no longer active more quickly. If a subscriber's contract with an operator has been cancelled, for example, Max can factor that in when verifying the number.

Limits and timing

The organization running Max will be able to send queries about a specific subscriber number to GIS KSIM free of charge. The volume will be capped at 1,500 requests per minute. The ministry's order on the connection is due to take effect on 1 March 2027.

The ministry presents the change as a security measure: it should help protect users and reveal the risk of accounts being misused. It also says data in GIS KSIM is transferred with subscribers' consent and is reliably protected.

What GIS KSIM is

GIS KSIM was built on an information resource of the communications regulator Roskomnadzor. It was meant to cross-check the data that operators submit, and some of that information has flowed automatically to Roskomnadzor since 2022. The list of data operators must enter has been expanded to include details of the employee who signed the contract and the number of SIM cards registered to one person.

The move follows an earlier ministry statement that it plans to have operators block all SIM cards belonging to a user whose Max account is banned for fraud. Such a user could also be barred from buying a new SIM card for a period of time.

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Tags:maxmessengerrussiagis ksimphone numbersminzifry