Vietnam enforces biometric SIM verification, impacting millions of users

From June 15, Vietnam's Ministry of Science and Technology began enforcing a new regulation that requires mobile‑phone users to re‑authenticate their biometric data whenever a SIM card is transferred to a new device. Under the rule, telecom operators must automatically suspend outgoing calls and SMS for two hours after detecting a device change, prompting the subscriber to scan their face for verification. Subscribers have 30 days to complete the facial‑recognition update; failure to do so leads to a two‑way lock of the number, after which the operator may terminate the contract and permanently revoke the service.

The regulation aims to curb the resale and use of pre‑activated “black‑ market” SIMs and to strengthen the security of telecom services. VinaPhone, one of the country's major carriers, warns that nearly three million of its subscribers have not yet completed the required verification. Those customers risk service disruption, loss of OTP messages, and inability to access online banking or e‑government services after the deadline. The carrier advises affected users to visit authorized service points for assistance.

The enforcement will affect all mobile subscribers in Vietnam, with the potential to interrupt daily communications for those who do not comply within the stipulated period.