From 1 July, any business texting Australians under a brand name without registering it on the ACMA's SMS Sender ID Register has its messages labelled Unverified on the customer's phone. Registration stays open, but every day unregistered is a day your SMS looks like a scam.
The label does not block your message. It just tells your customer not to trust it.
Australia's SMS rules changed last week and plenty of businesses have not noticed yet. From 1 July, any SMS sent to an Australian mobile under a branded sender ID that is not registered with the ACMA's SMS Sender ID Register is now labelled Unverified on the recipient's phone.
The register opened on 30 November 2025 and the ACMA spent months urging small businesses and community groups to act before the deadline. The rules cover alphanumeric sender IDs, the brand name that appears at the top of a text instead of a phone number. Messages sent from plain mobile numbers are not affected, and the framework does not yet extend to RCS or MMS.
Registration happens through an ACMA-approved telco or messaging provider, not directly with the regulator. Most of the major SMS platforms have been chasing their customers to complete it for months.
There is a mercy in the design. The 1 July date is the start of enforcement, not a registration cut-off. A business that registers this week will see the Unverified label lift and its brand name display as normal.
The date unregistered branded sender IDs started displaying as Unverified on Australian phones
Why it matters
SMS is the highest-attention channel most Australian businesses own. Open rates that email marketers dream about, read within minutes, sitting in the same inbox as messages from family. That attention was built on trust, and the trust has been shredded by years of scam texts impersonating banks, tolls and delivery companies.
The register is the industry's answer. It makes the brand name at the top of a text mean something again. That is good news for legitimate senders in the long run.
In the short run it creates a two-tier inbox. Registered brands look normal. Unregistered brands carry a warning label that reads like a scam flag next to appointment reminders and delivery updates. For businesses running SMS marketing, booking confirmations or fraud alerts, an Unverified tag directly attacks the response rates that make the channel worth paying for. Some carriers may also filter or block unregistered traffic under their anti-scam controls.
What to do about it
Send yourself a test message today. If your own text arrives wearing an Unverified label, you have found this week's most urgent marketing task.
Register through your provider now. Klaviyo, Twilio, Sinch MessageMedia and the other major platforms all have a registration path. It is paperwork, not engineering.
Audit every system that sends SMS under your brand. Booking tools, CRMs, delivery platforms and payment reminders often text customers separately from your marketing platform. Each sender ID needs to be covered.
If you send from a plain number, weigh the upgrade. A registered branded sender ID now carries a verification signal a random mobile number never will.
The channel just got a trust layer. Businesses that treat registration as admin will keep it. Businesses that ignore it will watch their best-performing channel quietly stop performing.