WhatsApp Marketing Consent in Singapore: What the Do Not Call Registry Does Not Cover

The Do Not Call Registry does not cover WhatsApp. There is no list to screen your numbers against before a broadcast, and that part most Singapore SMEs have right. The part they get wrong is concluding that WhatsApp marketing is therefore consent-free. It is not. The PDPA still governs how you collected the mobile number and whether marketing is a use the person agreed to. Meta runs its own opt-in and opt-out rules on top, and enforces them by throttling or blocking your message templates. And since Meta moved to charging per template message rather than per conversation, a list built on weak consent is no longer just a legal exposure. It is a monthly bill.

Does the Do Not Call Registry apply to WhatsApp marketing messages?

No. The DNC Provisions in the PDPA apply to specified messages sent to a Singapore telephone number by voice call, SMS, MMS or fax. A message delivered inside an instant messaging app is not one of those channels. So there is no DNC check to run before a WhatsApp campaign, and a number sitting on the No Text Message register can still receive your WhatsApp template.

Two things follow from that, and the second one catches people out. First, the exemption is about the channel, not about the person. Nothing about it removes your obligations for the underlying personal data. Second, the exemption evaporates the moment your automation falls back to SMS. Plenty of SME marketing tools are set up to retry an undelivered WhatsApp message over SMS, usually because somebody switched it on during setup and never looked again. That retry is a specified message to a Singapore number, and it needs a DNC check or a valid exemption. Find out today whether your tool does this.

What consent do you actually need before sending a WhatsApp campaign?

Three separate layers, and all three have to hold.

• PDPA consent to use the number for marketing. A mobile number given to you so a courier could call about a delivery was not given to you for promotions. If the only basis you have is that the number is in your system, you do not have a basis.
• Meta's opt-in. Meta requires an explicit opt-in, collected on any channel you like, that makes clear the person will receive messages from your business and roughly what kind. A tick box buried in terms and conditions is not it.
• A working opt-out. Every marketing template needs an obvious way to stop, and the stop has to be acted on within a reasonable time. Under the PDPA's withdrawal rules, treat 10 business days as the outer limit, and aim for same day because the system can do it.

Record all three against each contact: what they agreed to, when, and through which form or conversation. If you cannot produce that record for a named person in under a minute, you do not really have consent, you have an assumption.

What changed in WhatsApp Business pricing, and what does it cost a small team?

The old model charged for a 24 hour conversation window, so once a template opened a window, everything inside it was covered. Meta now charges per template message, priced by category. Marketing is the most expensive category, utility messages such as order and appointment updates are cheaper, authentication is separate, and service replies you send inside an open customer service window are generally free.

For a small sender the shape of the bill matters more than the exact rate, which Meta revises and which differs by country. At roughly a few Singapore cents per marketing message, a 2,000 name list sent one promotion a month is a rounding error. The same list sent twice a week is a few hundred dollars a month, every month, and most of it lands on people who stopped reading months ago. Check the current Singapore rate card before you budget, because the number you remember from last year is probably not the number you will be charged.

The quality consequence is worse than the cost. Blocks and reports drag down your quality rating, Meta cuts your sending limit, and eventually your templates get rejected. That takes out your order confirmations and delivery notices too, because they ride on the same number.

How do you keep a WhatsApp list that is both compliant and cheap?

The same discipline fixes both problems, which is the useful part.

• Split the list by consent basis, not by how the contact was imported. Marketing opt-ins in one segment, transactional contacts in another, and never send a promotion to the second group.
• Move anything that can be a utility message into the utility category and write it as one. An order update is cheaper and more welcome than a promotion with an order update inside it.
• Suppress non-responders. If someone has not opened or replied in 12 months, stop paying to message them.
• Log every opt-out at the contact record, not just in the messaging tool, so it survives a change of platform.
• Keep one person accountable for the WhatsApp Business number, including who holds admin access to it. A marketing channel with no named owner drifts.

What should an SME do before the December sends?

December is when the promotional volume spikes and the person who normally checks the list is on leave. An afternoon covers it. Export the list you intend to message and confirm each segment has a recorded marketing opt-in. Open your tool's settings and confirm whether SMS fallback is on, and if it is, confirm there is a DNC screening step or turn the fallback off. Send yourself a test of each template and click the opt-out to prove it works. Pull the last three months of opt-outs and verify none of them are still on the send list. Finally, write down the current Singapore per-message rate against your planned December volume so the January bill is not a surprise.

None of this is difficult. It is simply the kind of task that only gets done when somebody schedules it, and the cost of skipping it arrives in two forms: a PDPC complaint from one annoyed recipient, or a quality rating drop that silently kills your order confirmations during your busiest fortnight.

Frequently asked questions

Can I message a customer on WhatsApp if their number is on the Do Not Call Registry?

Yes, as far as the DNC Provisions go, because they do not cover instant messaging apps. But you still need a valid basis under the PDPA to use that number for marketing, plus a recorded opt-in under Meta's rules. The DNC listing is a strong signal about what that person wants, so treat it as a reason to check your consent record rather than ignore it.

Does a WhatsApp opt-out also count as a PDPA withdrawal of consent?

Treat it as one. If a customer replies STOP or taps an unsubscribe button, the safe reading is that they have withdrawn consent for marketing through that channel. Record it against the customer, apply it across channels unless they clearly limited it to one, and do not let a different tool re-add them at the next import.

Do order confirmations and appointment reminders need marketing consent?

No. Messages that service a transaction the customer initiated sit under the utility category and are a different obligation, which is one reason to keep them strictly separate from promotions. The moment you add a discount code to a delivery notice, it becomes a marketing message and needs marketing consent.