SMS compliance in Vietnam

The rules that apply to business SMS sent to numbers in Vietnam, with the source for each.

Quiet hours

Advertising SMS only 07:00-22:00; max 1 ad SMS per recipient per 24h per sender (with consent).

Source: Decree 91/2020/ND-CP, Art. 13

Consent

Advertising SMS only with prior consent of recipient; not to numbers on DNC list (5656).

Source: Law on Personal Data Protection 2025 (eff. 1 Jan 2026); Decree 13/2023

Opt-out

Each advertising SMS must state how to refuse further messages; refusals honoured within 24h.

Source: Law on Personal Data Protection 2025 (eff. 1 Jan 2026); Decree 13/2023 / regulator rules

Prohibited content

Blocked: phishing/fraud, illegal or unlicensed gambling, adult content, hate/political content (most operators), counterfeit/illegal goods, unlicensed financial offers; URL shorteners often blocked.

Source: Operator content policies / national advertising law

Data protection law

Law on Personal Data Protection 2025 (eff. 1 Jan 2026); Decree 13/2023. Supervisory authority: Ministry of Public Security (A05).

Source: Law on Personal Data Protection 2025 (eff. 1 Jan 2026); Decree 13/2023

Sender ID rule

Brandname must be registered with AIS/VNCERT (Certificate of Identifier) and with operators; unregistered SIDs blocked.

Source: Operator/regulator registration rules

Other

Brand name must appear in every message body (since Aug 2024); DNC registration at 5656.

Source: Regulator/operator rules

This summary is guidance, not legal advice. Last verified 23 October 2026.