MTS’s "Blacklist" service allows users to add numbers they do not wish to answer to a blocking list. Numbers added to the blacklist will be unable to place normal calls to the user. The service is intended for individual users who wish to reduce nuisance calls, telemarketing calls, misdialed debt collection calls, scam calls, or other unwanted communications. Users can manage their blacklist via channels including the mobile app, personal account, USSD menu, or SMS.
The blacklist feature is primarily designed for incoming call control, rather than directly filtering all SMS. Users can manually add specific numbers or remove numbers that no longer need to be blocked. For fraud rings that repeatedly change their numbers, blocking individual numbers alone may not fully resolve the issue. Therefore, users should still combine this with carrier anti-fraud services, mobile system-level blocking, caller ID tools, and personal vigilance for comprehensive protection.
When using the blacklist service, users should avoid accidentally adding numbers from banks, hospitals, workplaces, delivery personnel, or family members to the restricted list. Businesses that contact customers via call centers, auto-dialing, or virtual numbers may also be proactively blocked by users. As such, businesses should reduce the risk of being marked as nuisance numbers by obtaining legitimate user authorization, providing clear identity disclosures, and maintaining a reasonable contact frequency.
The blacklist is not a substitute for formal fraud reporting. If users receive calls impersonating banks, carriers, government agencies, or law enforcement, they should not provide verification codes, bank card PINs, account passwords, or identity document details. If the call involves fund transfers, threats, or identity theft, users should retain information such as the number, call time, and call recording, and report the incident to MTS, their bank, and law enforcement authorities.
For carriers, user-side blacklists are a fundamental personal protection tool. Tackling more complex spam and nuisance communications requires additional measures including number reputation identification, bulk outbound call detection, anti-SIM box controls, enterprise sender authentication, and cross-carrier collaboration.
