Starting June 15th, Vietnamese mobile phone subscribers transferring their SIM card to a new device will face a one-way lock and be required to undergo facial biometric authentication to regain full service. This new regulation aims to enhance security and prevent fraud related to SIM card usage. The authentication process will verify the user’s identity before allowing the SIM to function on the new device. Authorities have not detailed the specific technology used for facial recognition or the process for users who may have difficulty with biometric scans. The move is part of a broader effort to tighten control over mobile subscriptions and combat illicit activities. This policy impacts all mobile subscribers in Vietnam when changing devices. The regulation is being implemented by mobile network operators across the country.