From 1 July 2026, every branded SMS sent in Australia without a registered Sender ID will display "Unverified" at the top of the message. Those messages will be dumped into a single grouped thread on the recipient's phone, alongside every other unregistered sender.
Your open rates. Your click rates. Your entire SMS marketing channel. All of it depends on a registration that takes minutes and that most Australian businesses have not done yet.
ACMA's SMS Sender ID Register has been open since November 2025. Telcos and messaging providers started processing registrations months ago. The deadline is 1 July. That is six weeks from today.
Why it matters
SMS marketing works because it sits in the recipient's personal message stream, between texts from family and friends. The moment your brand message gets stripped of its identity and dumped into a generic "Unverified" bucket, you lose the contextual trust that makes SMS convert at 3 to 5x email rates.
Deadline for Australian SMS Sender ID registration before messages display "Unverified"
The registration requirements are straightforward. Australian entities need an ABN and their Sender ID must align with a registered business name, company name, trademark or domain name. The process is not complex. But the consequence of inaction is severe.
This is part of the government's anti-scam initiative. The intent is to prevent fraudsters from impersonating brands via SMS. The side effect is that every legitimate business using SMS marketing, appointment reminders, two-factor auth, delivery notifications or customer service messages needs to register or face deliverability collapse.
Klaviyo, Dotdigital and other ESPs have published guides. Your messaging provider likely handles the registration on your behalf. But you need to initiate it.
What to do about it
Check with your SMS provider this week. Ask whether your Sender IDs are registered. If you use multiple providers or have legacy systems sending transactional SMS, audit all of them. The registration window is open now. Do not wait until June. If you manage SMS for clients, send them a brief this week explaining the deadline and what happens if they miss it. This is a five-minute task that protects an entire marketing channel.
