Here's a number that should change how you think about SMS: the average SMS open rate in Australia is 98%. Almost every single message you send gets read. And yet, for most Australian businesses, the reply rate to those messages is somewhere between 5% and 15%.
That gap — between being read and getting a response — is entirely a copywriting problem. The message was seen. The customer just didn't feel compelled to act on it.
This guide covers the exact principles behind SMS messages that generate real replies. Not theory. Actionable formulas, before-and-after rewrites, and the specific words and structures that consistently outperform everything else across Australian business categories.
Why Most Business SMS Messages Fall Flat
Before covering what works, it's worth understanding the failure modes. After reviewing hundreds of Australian business SMS campaigns, the same problems show up repeatedly:
- Too long: A single SMS is 160 characters. Messages that push past this get split across multiple texts, which looks unprofessional and confuses readers.
- No clear ask: The message delivers information but never tells the customer what to do with it. No CTA, no reply prompt, no next step.
- Generic sender name: A message from "61412345678" gets half the engagement of a message from "SMITH DENTAL". Customers don't reply to strangers.
- No personalisation: "Dear Customer" kills conversion. First names cost nothing and change everything.
- Wrong timing: A promotional SMS at 7 PM on a Saturday goes into a mental "deal with later" folder that never gets opened again.
- Sounds like a bot: Formal, stiff language creates distance. Australians respond to conversational, direct communication.
The good news? Every one of these is fixable with a small rewrite and the right platform. A well-structured bulk SMS campaign that fixes these fundamentals will outperform an expensive one that doesn't.
The SMS Copywriting Formula That Works
The best-performing business SMS messages follow a simple structure. It's not complicated, but when you see it laid out clearly, you'll immediately recognise what your current messages are probably missing.
The Monster SMS Formula
2. Context → one line on why you're texting
3. Value → what's in it for them
4. One CTA → a single, clear action to take
5. Identity → who sent this
6. Opt-out → legally required, keep it brief
That's it. Six elements. Not all six are required in every message — transactional texts (booking confirmations, delivery updates) don't need a value proposition, for example — but the ones you include need to be tight.
Seeing the Formula in Action
Here's the same message written poorly versus written using the formula:
This is a reminder that you have an appointment booked with us. Please contact us if you need to reschedule. Thank you for your business.
Hi Sarah, confirming your appointment with Clear Skin Clinic this Fri 21 Mar at 10am. Reply YES to confirm or call 02 9123 4567 to reschedule. Reply STOP to opt out.
The "good" version is longer — but it's doing real work. It names the customer, specifies the appointment, gives a clear action (reply YES), and provides an alternative. The first version does none of that and will generate a fraction of the confirmations.
The Single CTA Rule: The Most Important Thing in This Guide
If there is one rule to internalise before anything else, it's this: one message, one ask.
The moment you put two calls to action in a single SMS — "Reply YES to confirm, or call us, or click here to reschedule, or check out our new services" — you've created a decision problem. When a human brain is presented with multiple options in a brief, low-effort format like a text message, the easiest choice is to do nothing.
Pick the one most important action you need the customer to take. Every other option is a distraction that will cost you replies.
The exception: if you genuinely need to offer a primary and fallback action (e.g., "reply YES to confirm, or call us if you need to reschedule"), that's fine — but frame the primary action first and make it the path of least resistance.
Writing Prompts That Actually Get Replies
The reply prompt is the most underdeveloped element of most business SMS messages. "Contact us if you have any questions" is not a reply prompt. Here are the structures that actually work:
Keyword replies (highest conversion)
Asking customers to reply with a specific keyword is the most frictionless reply mechanism available. It's clear, it works with automated sorting, and it feels like a real interaction:
- Reply YES to confirm — booking confirmations, appointments
- Reply INFO for details — promotions, new services
- Reply BOOK to grab a spot — time-limited availability
- Reply 1, 2, or 3 — preference surveys, service selections
- Reply QUOTE for a free estimate — inbound lead generation
Direct questions
A direct question in an SMS is harder to ignore than a statement. Compare:
We have appointments available this week for your annual check-up.
Hi Tom, are you due for your annual check-up? We have a spot this Thu 22 Mar at 3pm — want us to book it in? Reply YES or NO. From City Health.
Time-limited offers
Genuine urgency — not manufactured scarcity, but real deadlines — significantly improves response rates. "This offer expires Friday" is honest and effective. "HURRY LIMITED TIME OFFER!!!" reads like spam and damages trust.
20 SMS Templates That Get Real Replies
These are based on high-performing messages from Australian businesses across multiple industries. Adapt them to your context, but resist the urge to over-edit — the brevity is the point.
Appointment & Booking Confirmations
Promotional & Sales Messages
Quote Follow-Ups
Feedback & Reviews
Payment & Invoice Reminders
Need even more ready-to-use copy? We have a full library of 50 SMS templates across 10 business categories — worth bookmarking.
Timing: When Australians Actually Reply to Texts
The best-written message sent at the wrong time will underperform a mediocre message sent at the right one. Here's what the data says for Australian audiences:
- Best overall window: Tuesday to Thursday, 10am–12pm and 5pm–7pm AEST
- Promotions & offers: Tuesday–Wednesday 10am–12pm (highest purchase intent mid-week)
- Appointment reminders: 24 hours before (day-before) + same-day morning works best
- Post-purchase follow-up: 2–4 hours after the transaction or service completion
- Avoid: Before 8am, after 8pm, and Sunday mornings (very low response, high opt-outs)
Tip: Don't assume your customers all sit in the same time zone. If you're sending to a national list, segment by state and schedule in local time. A 10am send in Sydney is 8am in Perth — a meaningfully different context for the reader.
Personalisation Beyond First Names
Using a customer's first name is table stakes. The businesses seeing the highest reply rates are going further:
- Reference their last purchase or service: "Your last haircut was 6 weeks ago" beats "it's been a while" every time
- Location-specific language: "Available in Brisbane this week" signals relevance to local customers
- Behaviour-based triggers: Messages triggered by a specific action (abandoned quote, website visit, missed appointment) outperform scheduled campaigns significantly
- Segmented lists: A message about roof maintenance sent only to customers who had roof work done 2 years ago will feel relevant, not like a broadcast
This is where AI-powered platforms earn their keep. An AI SMS agent can handle dynamic personalisation at scale, sending messages that feel individually crafted even when they're going to thousands of customers simultaneously. It can also handle replies intelligently, continuing the conversation rather than leaving a customer's "YES" sitting in an inbox.
The 5 Mistakes That Kill Your Reply Rate
Sending from a number, not a name
Register a Sender ID (your business name) so your messages look professional and trusted. Anonymous numbers get ignored or blocked.
Burying the CTA at the end
If the first sentence doesn't give context, many readers won't make it to your call to action. Lead with what matters, then the ask.
Using ALL CAPS for emphasis
CAPS reads as shouting and triggers spam filters. Use punctuation and word choice for emphasis instead. It also signals "promo", which reduces trust.
Including multiple links
One link per message. Two or more links looks like spam and makes the message feel cluttered. If you must include more, use a landing page.
Not testing send times
Split your list in half and test two different send windows. The timing data you gather will be more valuable than any generic benchmark.
Compliance: What Every Australian Business Must Include
Writing for engagement and writing for compliance aren't opposites — but you do need to know the rules. Under Australia's Spam Act 2003, every commercial SMS must:
- Identify the sender clearly — your business name must be in the message or the sender field
- Be sent only to people who have consented — either explicitly (they opted in) or through an existing commercial relationship
- Include a way to unsubscribe — "Reply STOP to opt out" is the standard, and it must work
There's also a new requirement coming: from 1 July 2026, businesses using alphanumeric Sender IDs (your business name in the "from" field) must be registered with ACMA's SMS Sender ID Register. The registration deadline is 15 May 2026. Unregistered IDs will show as "Unverified" on recipient devices, which will significantly harm delivery and trust. For the full picture on what this means for your business, see our complete Australian SMS compliance guide.
ACMA Sender ID Registration: If you use a branded Sender ID (e.g., "MONSTER SMS" instead of a phone number), you need to register it via your SMS provider before 15 May 2026. Monster SMS handles this process for you — contact our team and we'll get it sorted. Unregistered IDs will display as "Unverified" from 1 July 2026.
Your Pre-Send Checklist
Before hitting send on your next campaign, run through this list. A 60-second check that catches most of the common mistakes:
Is the opening personalised? At minimum, include the customer's first name.
Is there exactly one CTA? If you've got two asks, remove the weaker one.
Is the message under 160 characters? Or, if longer, is it intentionally two-part and formatted correctly?
Is your business name clear? Either in the Sender ID or in the message body.
Is the opt-out included? "Reply STOP to opt out" — required by law and best practice.
Is the timing right? Sending between 8am and 8pm local time, avoiding weekends for promotions?
Have you sent a test to yourself? Read it as a customer, not as the person who wrote it.
Is your list consented? Only send to contacts who have opted in or have an existing commercial relationship with you. For more on building a quality list, see our guide to SMS customer retention.
Putting It All Together
SMS copywriting isn't a dark art. It's a small set of principles applied consistently: personalise the opening, be clear about what you're asking, make the action frictionless, identify yourself, and stay compliant.
The businesses that do this well don't write perfect messages every time. They test, measure reply rates, iterate, and gradually build a library of high-performing texts that run in the background automatically. Over time, that library becomes a genuine competitive advantage — a direct line to customers that no algorithm or ad platform can disrupt.
If you want to see what that looks like in practice, our guide to AI SMS auto-reply covers how to set up automated, conversational responses that keep the dialogue going even when you're not at your desk.
Start Writing SMS That Gets Results
Monster SMS gives you the tools to write, schedule, personalise, and automate messages that your customers actually reply to. Australian-built, Spam Act compliant, and genuinely simple to use.
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