Australia’s SMS Sender ID Register and unsubscribe rules

Australia's SMS Sender ID Register is already part of the operating environment for branded business messages. It should sit alongside your consent and unsubscribe processes when you review an SMS campaign. Completing one of these tasks does not complete the others.

This article was checked on 2 November 2026. It is general information for planning a business workflow. Check the linked official guidance and obtain advice about the circumstances of your organisation before relying on a particular legal interpretation.

The sender ID change took effect on 1 July 2026

A branded sender ID is the name or label shown where a mobile number might otherwise appear. ACMA says that, from 1 July 2026, an unregistered sender ID is replaced with Unverified. Its business guidance explains registration and the connection required between the sender ID and the organisation.

This is a current requirement, not an upcoming deadline. If your organisation uses a branded label, ask its telco or messaging provider to confirm the registration and authorisation arrangements for that label. Keep that confirmation with the operational setup records. Do not assume that a brand name displayed in your gateway has completed the registration process.

The register concerns sender identification. It does not provide a list of people who consent to marketing, and it does not mean that a particular campaign has been approved by ACMA.

Permission to send remains a separate question

Before selecting recipients, establish the basis on which your business may send that type of commercial message. Keep the relevant consent evidence and any limits on it. Avoid treating a past purchase, a matching customer record or a successful number-format check as a universal marketing permission.

The Australian Government's commercial messaging guide explains express and inferred consent. It also describes the requirement to identify the sender and provide an unsubscribe method. When another organisation sends on your behalf, your governance process still needs to account for the messages your business authorises.

Make the unsubscribe method usable

ACMA's spam guidance says unsubscribe instructions must be clear, requests must be honoured within five working days, and the facility must remain functional for at least 30 days after sending. It must not require an account or extra personal information, and it cannot impose a fee beyond the usual communication cost.

For a practical operating standard, apply new suppressions before the next marketing send. Test the method on a real handset, including messages with branded sender IDs where replying may not be available. Check the destination page, the record created behind it and the exclusion in the actual sending platform.

A website confirmation is one step. The business also needs an owner for receiving requests, applying them across relevant lists, handling failures and checking any campaign already queued elsewhere. Maintain an alternative contact route for people who encounter a problem.

Know which register you are checking

The government SMS Sender ID Register, the government Do Not Call Register and 0TXT's voluntary register have different purposes. The Do Not Call Register's consumer FAQ explicitly says it does not prevent SMS marketing.

0TXT is a private preference service for participating businesses. It allows a verified number holder to request no SMS marketing from those participants, and it allows a business to compare its own contacts with the active preferences. Participation does not amount to government endorsement or certification of all messages sent by a member.

0TXT keeps a direct business unsubscribe separate from voluntary registration. A recipient following the business's short link can unsubscribe without joining the register or completing phone verification. Verification is used when a person chooses to establish or remove the broader voluntary preference.

Put the checks into one campaign record

Before release, record who approved the campaign, where consent evidence is held, which sender ID and provider are used, when the actual audience was washed, and how suppressions reached the sending system. Confirm that the unsubscribe route works and that someone will monitor new requests after release.

Review these checks when the provider, brand, audience or campaign purpose changes. For an existing operation, start with the weakest link in that process rather than assuming that a registered sender name completes the review.

You can read how 0TXT supports businesses and apply to participate. The service helps record and communicate preferences; your organisation remains responsible for its sending decisions and legal obligations.