Risks of Viettel SIM lock for many users as verification rules take effect

Many mobile subscribers are receiving messages requesting verification and updates to subscriber information. With Circular 08 taking effect from April 15, 2026, ignoring these notices and failing to complete verification can result in the SIM being locked, and in some cases revoked after the prescribed period.

Circular 08 takes effect; SIM lock risk begins May 1

According to the operators, the SMS sent to subscribers warns that the information “may not be accurate” and requires users to verify again via the official app or at a transaction point. Viettel has issued SMS notices in formats including: the subscriber’s data has been confirmed as not matching the registered information, and the subscriber will be blocked from receiving calls and SMS dated 01/05/2026 if the information is not updated correctly under Circular 08/2026/TT-BKHCN.

Under the effective date of Circular 08/2026/TT-BKHCN (April 15, 2026), users have 15 days after the operator’s notice to update and verify information. As a result, the first group of customers faces SIM lock risk on May 1, 2026.

How to check whether your information is correct

To confirm whether subscriber information is accurate, users can text TTT B Số CCCD or CMND to 1414 to cross-check. If there are differences, users should follow verification procedures via the VNeID app, My Viettel, or at Viettel stores.

Risks if SIM verification is not completed

Operators list several potential consequences for users who do not verify their SIM information:

• Interrupted communications: unverified numbers may be blocked one-way, then two-way if not updated promptly.
• Number revocation: if verification is not completed, the SIM may be revoked, potentially resulting in loss of a long-used phone number.
• Security risks: inaccurate information can create vulnerabilities affecting personal security.
• Fraud risks: unverified numbers can complicate tracing, contributing to more spam calls, unwanted messages, and scams.
• Impact on digital services: banks, e-wallets, and public services are tied to the phone number; a disrupted or revoked SIM may lead to access loss or transaction difficulties.
• Legal risks if the SIM is not registered to the owner: it may be difficult to prove usage rights in disputes, and the registered subscriber owner bears responsibility for the number.

Verification via MyViettel: steps

Viettel outlines the following process to verify and standardize subscriber information through the MyViettel app:

1. Download and install the MyViettel app.
2. Open the app and log in using the Viettel phone number being used. On the home screen:
   • For subscribers registering a mobile SIM with a 9-digit ID or a 12-digit citizen ID: select “Xác thực thông tin thuê bao” (Verify subscriber information).
   • For prepaid customers registering with other documents (passport, military/police IDs) or those who received a verification notice from a Viettel short code: select “Chuẩn hóa thông tin” (Standardize information).
3. Take photos of the ID card (CCCD) and a portrait photo.
4. Scan the chip on the CCCD.
5. Check and compare information with the CCCD.
6. Review contract information and sign electronically.
7. Confirm with an OTP.
8. Receive notification that the document update was successful.

The verification process is intended to align SIM data with official identity documents and ensure compliance with the new directive. Additional guidance is available through operator channels.