Are messenger broadcasts legal: the consent that saves the number and the company
Short answer
A messenger broadcast is legal where the recipient has consented to such messages and the platform's rules and the country's advertising and personal-data law are respected. Consent isn't a checkbox for its own sake — it's a trail: when, to what, and how a person agreed. Without it, numbers are lost to complaints fastest, and the company answers, not the platform.
The platform blocks you for complaints. The law arrives later — and not at the number, at the company.
Ask whether a broadcast is legal and you’ll hear two answers. Either “what’s the harm, everyone does it,” or “but we have an official channel.” Both miss. What makes a broadcast legal isn’t nerve or a checkbox at the provider — it’s one boring question: did the recipient actually agree?
What “legal” means here
A broadcast has three borders, and you have to clear all of them.
Platform rules. Each messenger has its own terms for bulk messages, and they change. Break them and the number is restricted, with no one to argue with.
Advertising law. A promotional message almost everywhere requires the recipient’s consent and a clear signature: who’s writing and how to opt out. The details depend on the country.
Personal data. A customer’s number is their data. Where you got it, what the person agreed to, and where it’s stored are questions you’ll one day be asked to answer.
The platform punishes first — complaints do the work. The law is slower, but it comes to the company, not the number.
What counts as consent
Consent isn’t a line in the text or a box ticked on the customer’s behalf. It’s a clear action by the person: they left a number for a stated purpose, ticked consent, wrote first. What’s valuable isn’t consent itself but the trail it leaves: when, to what, and how someone agreed — and whether you can show it if asked.
A separate trap is purpose. A number left for delivery is not consent to offers to buy more. A service message about their own order and an ad for something new are different things, even if they go from the same number.
Where the line runs
Simple rule: the less the person chose, the closer you are to spam.
- They wrote first or left a number for a broadcast — you’re on solid ground.
- They left a number for another purpose — a service message for that purpose is fine, advertising isn’t.
- You bought a base or scraped numbers somewhere — that’s consent to nothing.
The line isn’t about whether the message arrives. It will. It’s about who answers when the recipient complains — and they will.
What to check before launch
- It’s clear where each number in the base came from
- You can see what the person agreed to, and when
- Service messages are separated from promotional ones
- The message makes clear who’s writing and how to opt out
- Opt-outs are excluded, and that’s recorded somewhere
- Text and volume match the platform’s rules
- A lawyer has seen how the company collects consent and signs messages
The country’s law and platform rules change — that’s a question for a lawyer, not an article. The article answers a different one: without consent, a broadcast doesn’t become legal just because it arrived.
Everything else we discuss in person.
Spam arrives the same way a broadcast does. The difference is who answers for it.
Questions and answers
Is it legal to broadcast on WhatsApp and Telegram?
Where the recipient has consented to such messages and the platform rules and the country's advertising and personal-data law are respected — yes. Where the person chose nothing and agreed to nothing, it's not a broadcast but spam, and the company answers for it.
What counts as a customer's consent?
A clear action by the person: they left a number for a stated purpose, ticked consent, wrote first. What matters isn't the word 'consent' but the trail — when, to what, and how someone agreed, and whether you can show it if asked.
Can I message people who just left a number at checkout?
It depends on what they agreed to. A number for delivery isn't consent to promotional messages. A service note about their own order is one thing; an offer to buy more is another. The country's law draws the line, not the convenience of a broadcast.
What's the risk of broadcasting without consent?
First, complaints and number blocks: the platform reacts faster than any law. Then, claims under advertising and personal-data law — against the company, not the number. Losing a number is unpleasant; answering for the base is costlier.