SIM Card Registration in Thailand for Foreigners (NBTC Rules)

TL;DR

All Thai SIM cards — prepaid and postpaid, voice and data, physical and eSIM — must be registered to a verified real identity. The rule originates in the NBTC Notification on Identification of Mobile Telephone Subscribers B.E. 2558 (2015), issued by the National Broadcasting and Telecommunications Commission (NBTC / กสทช.), and has been progressively tightened. Foreigners register using a passport (Thai citizens use their National ID); each operator (AIS / TrueMove H / NT-dtac) allows up to 5 SIMs per person. Since 2024-2025, biometric face-scan verification has been rolled out at the major operators for new registrations and SIM swaps. Tourist SIMs are still registered against the passport. Unregistered or fraudulently registered SIMs are deactivated and re-issuance requires fresh identity proof.

Why Thailand Mandated SIM Registration

Before 2015, anonymous SIMs were widely sold at convenience stores. The NBTC's Notification of B.E. 2558 (2015) — titled "Identification and Registration of Mobile Telephone Subscribers" — required all operators to verify subscriber identity at sale. The stated objectives were:

• Counter-fraud: reducing call-centre and online scam operations using burner phones.
• Anti-terrorism and public safety: aligning with FATF and ASEAN security commitments.
• Consumer protection: allowing genuine users to dispute charges and recover stolen numbers.
• Lawful intercept: enabling court-authorised investigation of specific subscribers.

Subsequent NBTC notifications in 2017, 2019, and 2023 progressively tightened the regime — adding biometric checks for high-risk cases, photographed-with-passport verification, the 5-SIM-per-operator cap, and the 2024 face-scan rollout for SIM swaps and number ports.

Foreigners: Use Your Passport

Tourist or short-stay foreigners can buy a SIM at airport kiosks, 7-Eleven, Family Mart, Tesco Lotus / Lotus's, Big C, and operator-owned shops. All channels are required by NBTC to scan and store the passport image at sale.

The 5-SIM-Per-Operator Limit

Each subscriber is capped at 5 active SIMs per operator, totalling up to 15 SIMs across the three major operators. The cap is enforced at registration. Reasons for the cap include preventing wholesale-to-fraud SIM diversion and bringing Thailand into line with international AML practice. Where a subscriber genuinely needs more (business with multi-line use), the operator's business account regime applies — different identification (company affidavit + director's passport) and no consumer cap, but more paperwork.

Biometric Face-Scan (Introduced 2024-2025)

Since 2024, major Thai operators have rolled out biometric face verification for:

• New SIM registration at operator shops.
• SIM swap (replacing a lost or damaged SIM tied to an existing number).
• Mobile Number Portability (MNP) — porting between operators.
• Postpaid account changes where the registered identity is updated.

The face scan uses a tablet or smartphone camera, compares the live face to the photo in the passport's MRZ chip, and records the result against the subscriber file. Stores are required to delete any photo not used for verification within a short retention window per PDPA (Personal Data Protection Act B.E. 2562 (2019)).

Prepaid vs Postpaid

Prepaid is the dominant choice for tourists and short-stay foreigners. Registration is simple — passport scan + face verification (if at an operator shop) — and there is no credit check, no Thai bank account requirement, and no minimum commitment. Top-ups are by voucher, app, ATM, or 7-Eleven.

Postpaid requires more documentation — typically a Thai bank account, proof of address (Yellow Tor Ror 13 or recent utility bill), and in some cases a deposit. Postpaid plans offer better international roaming rates, generally larger data allowances per baht, and predictable billing. Most foreigners on long-stay visas move to postpaid after settling.

The Three Operators

The 2023 NT-dtac merger reduced the major-operator count from three to effectively three brands but two infrastructure groups (CAT/TOT-merged NT + dtac; True; AIS). The NBTC retained number portability and prepaid pricing controls to protect competition.

eSIM, Tourist SIMs, and Roaming

• eSIM is available from all three operators for newer iPhones and Pixel devices. Registration is identical — passport scan in-app or in-store — and provisioning is electronic.
• Tourist SIMs at the airport are still registered against the passport; they are not anonymous. Typical tourist packs offer 15-30 days of data with international call allowance.
• Mobile Number Portability (MNP) is open across all major operators; the porting process takes 24-48 hours and triggers biometric verification.
• Roaming: All Thai SIMs roam internationally on the operator's partner networks; activate roaming via app or USSD before travel. Postpaid plans typically have more generous roaming inclusions.

Lost Passport with Registered SIMs

If your passport is lost or stolen with active Thai SIMs registered against it, the procedure is:

1. Report the passport loss at the local police station and obtain the police report.
2. Visit the embassy to apply for an emergency travel document or new passport. Bring the police report.
3. Visit the operator shop with the new passport + police report + the old SIMs (if you still have the physical SIMs or the numbers in writing). Operators can re-link the subscription file to the new passport number after biometric verification.
4. For postpaid contracts, the operator may temporarily suspend the line until identity is re-verified, to protect against fraudulent SIM-swap attempts.

NBTC Complaints

If you believe a SIM was issued in your name without authorisation, or you have been overcharged, harassed, or denied service:

• File a written complaint to the NBTC Consumer Protection Office (สำนักรับเรื่องร้องเรียนและคุ้มครองผู้บริโภคในกิจการกระจายเสียง กิจการโทรทัศน์ และกิจการโทรคมนาคม).
• Hotline 1200 for telecom consumer issues.
• The operator must respond within prescribed timelines under NBTC consumer-protection rules. Unresolved complaints escalate to the NBTC commission and ultimately the Administrative Court.

Common Mistakes

Avoid these traps:

• Buying a SIM "off-the-books" from informal sellers. These are unregistered or registered against a stranger's identity and are routinely deactivated.
• Letting someone register a SIM in their name "for you". Disputes, fraud, and number recovery become impossible.
• Exceeding the 5-SIM-per-operator cap with multiple shops. The cap is centrally tracked and the sixth SIM will be deactivated.
• Ignoring biometric requirements on SIM swap. No face scan, no swap — bring time and a clean passport.
• Assuming a tourist SIM is anonymous. It is fully registered against your passport, just like any other.
• Forgetting to update the operator after a passport renewal. When your old passport expires, link the subscription to the new passport number on your next shop visit to avoid issues on SIM swap or porting.

FAQs

1. Can I buy a SIM in someone else's name?

Not lawfully. Each SIM must be registered against the user's own passport or ID. Using another person's identity is an offence under the Criminal Code B.E. 2499 (1956) (false statement) and a breach of NBTC rules.

2. Does the face scan store my biometric data?

The operator must comply with PDPA — the live face image is used to compare against the passport chip photo and is retained only within the lawful purpose and retention period; subscribers can request access and deletion under PDPA rights.

3. Can I keep my Thai number when I leave Thailand?

Yes, for as long as the SIM is active and the account in good standing. Prepaid SIMs lapse after a set period without top-up; postpaid lines require continued payment or a "vacation" plan if the operator offers one.

4. What if I have more than 5 SIMs for genuine business use?

Open a business postpaid account in your company's name (DBD certificate + director's passport). Business accounts are not subject to the personal 5-SIM cap.

5. Are eSIM tourist plans truly registered?

Yes. The operator captures your passport scan during in-app KYC. There is no anonymous eSIM in Thailand under NBTC rules.

Related Reading

• PDPA Enforcement Actions in Thailand
• Yellow Tabian Baan for Foreigners
• Pink ID Card for Long-Stay Foreigners
• How to Open a Thai Bank Account
• E-commerce Consumer Rights in Thailand