SMS has quietly become one of the higher-performing channels available to Shopify merchants, largely because open rates on text messages remain dramatically higher than email, most people check a text within minutes of receiving it, whereas an email can sit unread for days. But SMS is also a channel with real rules attached, particularly in Australia, and a much lower tolerance for getting it wrong: a customer who’s mildly annoyed by an email unsubscribes; a customer who’s annoyed by an unwanted text tends to react more strongly, and the compliance stakes for unsolicited SMS are genuinely higher than email.
This guide covers what an Australian Shopify merchant actually needs to know before turning SMS on: consent and compliance basics, how sender IDs and carriers work locally, and where SMS earns its place in a marketing programme rather than just annoying customers who didn’t sign up for it.
Why SMS Is Different From Email, Not Just Shorter
The core difference isn’t message length, it’s intimacy and immediacy. A text message lands in the same inbox as messages from friends and family, which means the bar for relevance and respect is higher. Used well, this makes SMS extremely effective for time-sensitive, high-value messages (an order shipped, a cart about to expire, a flash sale ending tonight). Used poorly, too frequent, too promotional, sent at odd hours, it burns trust faster than almost any other channel, and opt-outs happen quickly.
The practical implication: SMS works best as a smaller, more selective channel than email, not a parallel version of your full email programme sent by text.
Consent and Compliance in Australia
This is the part merchants most often underestimate. SMS marketing in Australia sits under the Spam Act 2003, administered by the ACMA, and the rules are specific:
- You need express or inferred consent before sending marketing SMS, a customer providing their phone number at checkout for order updates is not automatically consent to receive promotional texts. Consent for marketing SMS needs to be captured separately and explicitly (typically via a clearly labelled checkbox or dedicated opt-in flow, not pre-ticked by default).
- Every marketing SMS needs clear sender identification (who the message is from) and a functional opt-out method (commonly a “reply STOP to unsubscribe” instruction that actually works).
- Consent needs to be kept as a record, most SMS platforms integrated with Shopify (Klaviyo’s SMS feature, Postscript, Attentive) handle this automatically through their opt-in flows, but it’s worth confirming your specific opt-in method actually satisfies these requirements rather than assuming.
Getting this wrong isn’t just a deliverability problem the way spam-flagged email is, non-compliant SMS marketing carries real regulatory risk under the Spam Act, so it’s worth treating consent capture as a genuine compliance task, not a growth-hack checkbox to minimise.
How Sender IDs Work for Australian Numbers
Unlike some markets where a short code is standard, Australian SMS marketing commonly uses either:
- A dedicated long virtual number (LVN), which looks like a standard mobile number and supports two-way messaging (useful if you want customers to be able to reply)
- Alphanumeric sender IDs (your brand name displaying as the sender instead of a number), which work for one-way broadcast messages but don’t support replies
Most Shopify-integrated SMS platforms let you choose between these when setting up, and the right choice depends on whether you want conversational SMS (customer service style replies) or purely broadcast messaging (order updates, flash sale alerts). Confirm your chosen platform supports Australian carriers properly, some SMS platforms are built primarily for the US market and have patchier local delivery rates or higher per-message costs for AU numbers, which is worth checking before committing.
Setting Up SMS on Shopify: The Practical Steps
- Choose your platform. If you’re already using Klaviyo for email, its native SMS feature is the simplest integration since it shares the same customer profiles and flow builder. Dedicated SMS-first platforms (Postscript, Attentive) offer deeper SMS-specific features but mean managing consent and segmentation across two separate tools.
- Register your sending number/sender ID according to your platform and Australian carrier requirements, this can take longer than expected, so don’t leave it until the week before a planned campaign.
- Build a genuine opt-in flow, separate from your email signup. Common methods: a dedicated checkbox at checkout (unticked by default), a post-purchase SMS opt-in prompt, or a “text START to [number]” campaign.
- Set sending windows. Most platforms let you restrict sends to reasonable hours, this matters more for SMS than email, since a 6am promotional text lands very differently than a 6am email sitting unread in an inbox.
- Start with a small number of high-value automated flows rather than broad campaign blasts, see below.
Where SMS Earns Its Place: Practical Use Cases
Not every email flow needs an SMS equivalent. The use cases that consistently perform well for Shopify stores:
- Abandoned cart recovery, a well-timed SMS 1-2 hours after cart abandonment (after your first email, not instead of it) often lifts recovery rate meaningfully because of how quickly texts get seen
- Order and shipping updates, genuinely useful, high-open, low-annoyance content that also builds trust in the channel for later promotional use
- Flash sales and genuine urgency, SMS’s immediacy suits a 24-hour sale far better than a broader evergreen promotion
- VIP or high-value segment communication, reserving SMS for your most engaged or highest-spend customers rather than blasting the full list keeps opt-out rates low
What to Avoid
- Sending SMS at the same frequency as email. Most Shopify stores that succeed with SMS send it noticeably less often than their email campaigns, think a handful of times a month for broad promotional content, with automated flows (cart, shipping) as the higher-frequency layer.
- Duplicating every email flow into SMS. This is the most common early mistake, treating SMS as a second copy of the email programme rather than a distinct, more selective channel.
- Ignoring time zones and sending windows, particularly relevant for Australian stores with customers across multiple states and time zones.
Checklist Before You Launch
- [ ] Consent capture is explicit, separate from general marketing email opt-in, and compliant with the Spam Act 2003
- [ ] Sender ID/number registered and confirmed working for Australian carriers
- [ ] Opt-out (STOP) instruction tested and functioning
- [ ] Sending windows set to reasonable hours
- [ ] Starting flows limited to 2-3 high-value automations (cart abandonment, shipping updates) rather than a full duplicate of your email programme
- [ ] Reporting set up so SMS-attributed revenue is tracked separately from email
FAQ
Do I need separate consent for SMS marketing if a customer already opted into my email list in Australia?
Yes. Under the Spam Act 2003, consent for SMS marketing needs to be captured explicitly and separately from email opt-in, a customer agreeing to marketing emails hasn’t automatically agreed to marketing texts.
What’s the difference between a long virtual number and an alphanumeric sender ID?
A long virtual number looks like a standard mobile number and supports two-way replies, useful for conversational SMS. An alphanumeric sender ID shows your brand name as the sender but only supports one-way broadcast messages, no customer replies.
How often should I send marketing SMS to avoid high opt-out rates?
There’s no universal number, but most successful Shopify SMS programmes send broad promotional campaigns far less frequently than email, often a handful of times a month, reserving higher-frequency messaging for automated, high-relevance flows like cart abandonment and shipping updates.
Can I use Klaviyo for both email and SMS on my Shopify store?
Yes, Klaviyo supports native SMS alongside email, sharing the same customer profiles and flow-building tools, which is usually the simplest setup for stores already using Klaviyo for email rather than managing two separate platforms.
Is SMS marketing worth it for a small Shopify store just starting out?
It can be, but it’s usually worth building a solid email programme and list size first. SMS performs best layered onto an already-engaged customer base rather than as the first channel a brand-new store invests in.
Want SMS Set Up Alongside Your Email Programme?
SMS works best when it’s coordinated with your existing email flows, not bolted on separately. Our Klaviyo email marketing service covers SMS setup and integration as part of a unified customer messaging strategy, book a call to talk through what’s right for your store.
