Why the messages keep arriving
Unwanted text messages can come from advertising lists, telecom service promotions, paid subscriptions and scammers impersonating brands or public agencies. They are not all the same problem. A legitimate marketing message is irritating; an unauthorised paid content service affects your bill; a malicious link can be a much more serious security risk.
A 2009 Personal Thailand post complained about repeated texts and guessed that contact details were being traded. That story is not evidence that a particular company sold customer data. Today, a better first step is to identify the sender, determine whether the message has caused any charges and take action without opening suspicious links.
Check whether you are being charged
Review the messages and your recent prepaid balance or postpaid bill. A stream of marketing texts is not necessarily a paid subscription. Conversely, recurring small charges can be easy to miss. Compare your bill with the services you knowingly authorised and retain screenshots of disputed items.
If you find an unfamiliar subscription, contact your mobile operator through its verified app, website or customer-service channel. Request cancellation and an itemised explanation of charges. Do not reply to a suspicious SMS with personal information merely because it promises to remove you from a list.
Thailand’s *137 cancellation service
Thailand’s National Broadcasting and Telecommunications Commission (NBTC) describes *137 as a free route for cancelling unwanted or unintentionally subscribed SMS services on supported mobile networks. The NBTC also publishes operator-specific instructions because menu choices and circumstances can differ.
Try calling *137 from the affected Thai mobile number and follow the recorded instructions if your provider supports the service. If it does not work, use your network’s verified customer-service channel and ask about current alternatives. A cancellation request may not remove every message from unrelated senders.
Protect yourself from scam texts
Do not tap an unexpected payment, parcel, bank-account or identity-verification link just because it displays a familiar brand name. Sender IDs and message threads can be misleading. Open the organisation’s official app directly or type the address you already know instead of trusting the SMS.
Never share one-time passwords, banking PINs or account-recovery codes in response to a text. If a message claims that your account will close immediately unless you pay, treat the urgency as a reason to verify independently. If you clicked a suspicious link, stop entering information, check accounts using trusted channels and seek assistance from your bank or service provider.
Escalate a billing or service complaint
If an operator cannot explain a charge or repeatedly fails to resolve unwanted messages, keep the dates, message screenshots, case numbers and relevant bill entries. NBTC provides a telecommunications-consumer complaint channel and lists its free call centre as 1200 (Monday to Friday, 08:30–16:30). Before calling, confirm the current availability and language support using NBTC’s own directory.
Describe the problem precisely: unwanted advertisements, an involuntary premium SMS subscription, suspected fraud, or repeated charges after cancellation. These categories may require different handling. A telecommunications complaint alone does not automatically cancel a compromised banking payment.
Reduce new exposure without becoming unreachable
Do not post your primary phone number publicly or enter it on a promotional form unless necessary. Check the permissions you grant to shopping, delivery and loyalty programmes, and consider whether optional marketing consent can be declined. Save the operator’s genuine support channels so an unexpected text is easier to check.
Blocking a sender on your phone can reduce visible interruptions, but it does not necessarily cancel paid subscriptions or prevent another sender ID from contacting you. Use network-side controls as well as the phone’s filtering tools.
What if you are visiting with a tourist SIM?
If you use a short-term Thai SIM or eSIM, save the exact provider name and account number or app login before discarding the packaging. You may still receive unsolicited promotions, but the availability of self-service cancellation features can depend on your plan and how the number was activated.
Visitors using a foreign SIM on roaming should contact their home operator as well; the Thai network may not control all messages on an overseas number. Avoid assuming that a service code documented for domestic Thai SIMs works from every roaming device or foreign handset.
A practical five-minute checklist
First, stop clicking and responding to unexpected links. Second, inspect the bill for paid SMS services. Third, try the provider’s cancellation route, including *137 when applicable. Fourth, ask for confirmation and keep the reference number. Fifth, escalate any unresolved billing issue with your records.
The exact menu and contact details can change; the NBTC website and your mobile operator should be the final sources for live instructions. The aim is fewer unwanted messages, more control over paid services and better protection of your personal information.
