The one rule underneath everything
WhatsApp's Business Messaging Policy (last updated 23 September 2026) says a business may contact people only if they gave their phone number and opted in to receive messages or calls. The business is solely responsible for how it collects that opt-in and for obeying the law. Buying a list, copying numbers from a website, or messaging people who only called once is not opt-in.
How to collect opt-in properly
- Ask clearly, in one sentence, what you will send. For example: "May we send your booking reminders on WhatsApp?"
- Keep a record: who agreed, when, and to what.
- The policy's good practice is a separate opt-in for each kind of message, and for calls.
- Give a clear way to opt out, in every kind of message, and honour every opt-out and block request.
- Keep your WhatsApp Business profile accurate, with customer support contact details, and publish a privacy policy.
What gets a number blocked
People can block or report a business, and the policy says Meta may limit a business's ability to send messages or make calls based on that feedback. Access can be limited or removed for significant negative feedback, harm to people or policy violations, and termination may bar future use of WhatsApp products.
The things the policy prohibits include spamming or surprising people, sharing full card or account numbers, and passing information from one customer's chat to another customer. Some goods and services are restricted, among them alcohol and tobacco, drugs, medical products, adult products, multi-level marketing and payday loans.
Templates and the 24-hour window
A business may start a conversation only with an approved message template. Within the 24-hour customer service window, which opens and resets each time the customer messages you, you can reply without a template. Outside it, only approved templates may be sent. Meta can review, approve, pause or reject templates at any time, so use each template only for its stated purpose.
A safe habit (our advice)
Send fewer, more useful messages. Before any broadcast, ask: did every person on this list agree to this kind of message? If the answer is "I think so", leave them out. A small list of willing customers protects your number better than a big list of annoyed ones.
Write one clear opt-in sentence for your booking form today.
How this post was made: an AI drafted it from the official pages listed under Sources, every figure was checked against those pages, and the Reveaxa team approved it before it was published. Our own advice is marked as such. If a source changes, we update the post and its date.
Reveaxa guide reference: RVX-B-whatsapp-opt-in-without-getting-blocked