SMS Marketing: A Practical Guide for Serious Marketers (With Examples)

SMS marketing is the practice of sending promotional or transactional messages directly to customers via text message. It is one of the most direct channels available to marketers, with open rates that make email look sluggish, and it works precisely because it bypasses the noise of social feeds and inboxes to land in a space people actually check.

Done well, it is fast, personal, and commercially effective. Done badly, it is the fastest way to get someone to opt out of your brand entirely.

Why SMS Deserves More Serious Attention Than It Gets

I have sat in enough strategy sessions to know that SMS usually gets mentioned late, treated as a tactical add-on, and handed to whoever manages the CRM tool. That is a mistake, and it is one I have watched brands make repeatedly across retail, travel, and financial services.

The channel has an unusual quality: it feels personal in a way that email no longer does. When a message arrives on someone’s phone, it sits alongside texts from their family and friends. That context is powerful. It is also why the bar for relevance is so much higher than in other channels. Nobody wants a promotional message sitting next to a text from their mother.

Early in my career, I was working on a campaign for a travel client and we ran a last-minute SMS push to a segmented list of customers who had browsed but not booked. The conversion rate was not just good, it was embarrassingly good compared to the email equivalent sent the same day. Same offer, same audience, different channel. The difference was immediacy and context. SMS arrived when people were on their phones. The email arrived when they were at their desks and thinking about something else.

That experience shaped how I think about channel selection. The medium shapes the moment of reception, and that shapes behaviour. SMS is a channel that commands attention precisely because it is still relatively uncluttered. Most people receive dozens of marketing emails a day and a handful of SMS messages. The signal-to-noise ratio is completely different.

SMS sits within a broader mobile marketing ecosystem that includes app-based messaging, push notifications, and paid mobile advertising. If you want to understand how SMS fits into that wider picture, the Mobile Marketing Hub covers the full landscape in one place.

What Types of SMS Marketing Actually Work?

There are two broad categories: promotional and transactional. Most of the confusion in SMS marketing comes from brands blurring the line between them, or treating them as interchangeable when they are not.

Transactional SMS messages are triggered by a customer action. Order confirmations, shipping updates, appointment reminders, password resets, delivery notifications. These messages have an implicit permission because the customer expects them. They are also among the most read messages any brand sends. Open rates are high because the customer wants the information.

Promotional SMS messages are outbound. You are initiating contact to drive a commercial outcome: a sale, a visit, a booking, a sign-up. These require explicit opt-in consent, and they require a much higher standard of relevance to justify the interruption. A flash sale message to someone who bought from you six months ago and opted in to receive offers is a legitimate use of the channel. A generic promotional blast to a list you bought from a data broker is not, and in most jurisdictions it is also illegal.

Within those two categories, the use cases that consistently perform well include:

• Abandoned cart reminders with a time-limited incentive
• Back-in-stock alerts for products customers have expressed interest in
• Appointment confirmations and reminders in healthcare, hospitality, and services
• Event-based promotions with a genuine urgency (not manufactured scarcity)
• Loyalty programme updates and reward notifications
• Post-purchase follow-ups that invite review or repeat purchase

The common thread is relevance. Each of these use cases works because the message is contextually appropriate for the recipient at that moment. When SMS fails, it is almost always because someone sent the wrong message to the wrong person at the wrong time. The channel is not the problem. The targeting is.

How Do You Build an SMS List the Right Way?

List quality is everything in SMS marketing. A small, highly engaged list will outperform a large, indifferent one every time. I have seen this play out across dozens of client programmes, and the brands that treat their SMS list as a premium asset consistently get better results than those who treat it as a number to grow at any cost.

Opt-in collection needs to be explicit and double opt-in is worth the friction. You want people who genuinely want to hear from you, not people who ticked a box to get a discount and have already forgotten they did it. The latter group drives your opt-out rate up and your engagement metrics down, and it skews your view of what the channel can actually do.

Effective opt-in collection points include:

• Checkout flows where customers are already engaged and motivated
• In-store sign-up with a clear value exchange (early access, exclusive offers)
• Website pop-ups with a specific, compelling reason to subscribe
• Social media campaigns that drive SMS sign-ups with a genuine incentive
• Loyalty programme enrolment where SMS is positioned as a benefit

The value exchange matters. “Sign up to our SMS list” is not a compelling proposition. “Get early access to our sale before it goes live” is. Be specific about what subscribers will receive and how often. People are more willing to opt in when they know what they are signing up for, and they are less likely to opt out when the reality matches the expectation.

Crazyegg has a useful breakdown of what makes an SMS marketing programme work at a tactical level, covering list building, segmentation, and message construction in practical terms.

What Are the Legal Requirements for SMS Marketing?

This is the section most brands skip until they receive a complaint or a fine. Do not do that.

In the United States, the Telephone Consumer Protection Act (TCPA) governs SMS marketing and requires prior express written consent before sending promotional messages. The penalties for non-compliance are significant and class action litigation in this space is well established. The FCC enforces TCPA and has been active in recent years.

In the United Kingdom, the Privacy and Electronic Communications Regulations (PECR) apply alongside UK GDPR. Promotional SMS requires opt-in consent, and soft opt-in provisions that work for email do not automatically apply to SMS. The ICO has published clear guidance on this and has issued fines for non-compliance.

Across the European Union, GDPR sets the consent standard. Consent must be freely given, specific, informed, and unambiguous. Pre-ticked boxes do not qualify. Bundled consent buried in terms and conditions does not qualify either.

Regardless of jurisdiction, every SMS programme should include:

• Clear identification of the sender
• A simple opt-out mechanism in every message (STOP is the standard)
• Prompt processing of opt-out requests
• Documented consent records with timestamps
• Sending only during reasonable hours (typically 8am to 9pm local time)

If you are running SMS alongside a mobile app, the consent architecture can get more complex, particularly around push notifications and in-app messaging. Our piece on what a mobile app is and why it matters covers some of the channel overlap considerations worth thinking through.

How Do You Write SMS Messages That Actually Convert?

SMS copywriting is a discipline most marketers underestimate because they assume brevity means simplicity. It does not. Writing well in 160 characters or fewer is harder than writing a 500-word email. Every word has to earn its place.

The structural requirements are non-negotiable. You need to identify who you are, communicate the offer or reason for contact, include a call to action, and provide an opt-out mechanism. All of that in a message short enough to read in five seconds. There is no room for throat-clearing or brand waffle.

Some principles that hold up in practice:

Lead with the value, not the brand. “ASOS: 20% off everything today only. Shop: [link] Reply STOP to opt out” works better than “Hi from ASOS! We have an exciting offer for you today…” The customer does not need a warm-up. They need to know immediately whether this message is worth their attention.

One message, one action. SMS is not the place for multiple offers or competing calls to action. Pick the single most important thing you want the recipient to do and build the message around that. Every additional element dilutes the primary action.

Urgency needs to be real. “Today only” and “expires at midnight” work when they are true. When they are not, customers notice, and they stop trusting your messages. Manufactured urgency is a short-term tactic that erodes the long-term value of the channel.

Personalisation earns its keep. Using a customer’s first name is table stakes. Using information about their behaviour, purchase history, or preferences is what actually moves the needle. “Hi Sarah, the boots you saved are back in stock” is a fundamentally different message from “Hi Sarah, check out our new arrivals.”

Mailchimp’s work with WLRN is a useful real-world example of SMS marketing in practice, showing how a media organisation built and managed an engaged SMS subscriber base with a clear editorial purpose behind each message.

How Does SMS Fit Into a Broader Mobile Marketing Strategy?

SMS does not exist in isolation, and the brands that treat it as a standalone channel tend to underperform those that integrate it into a coherent mobile strategy. The question is not whether to use SMS. The question is where SMS does the specific job better than any other channel, and how it connects to the rest of what you are doing.

Consider the customer experience. Someone discovers your brand through a Google mobile ad, visits your mobile site, downloads your app, and makes a purchase. At various points in that experience, SMS can play a useful role: a cart abandonment prompt, a post-purchase confirmation, a loyalty update, a re-engagement message six weeks later. But it should be coordinated with what is happening in other channels, not firing independently without regard for what the customer has already received.

Channel orchestration is one of the things I spent a lot of time on during my agency years, particularly when managing large retail and travel accounts where customers were receiving communications across email, paid social, push notifications, and SMS simultaneously. The brands that got this right had a single view of the customer and a clear set of rules about channel priority and message sequencing. The ones that got it wrong were sending the same offer via three channels on the same day and wondering why opt-out rates were climbing.

If your brand has a mobile app, the relationship between SMS and in-app messaging is worth thinking through carefully. Push notifications can do some of what SMS does, but they require the app to be installed and notifications to be enabled. SMS reaches customers regardless of app status. They are complementary, not competing, but they need to be coordinated. Our guide to mobile marketing analytics covers how to track and attribute activity across these channels, which is essential if you want to understand what is actually driving outcomes.

For brands building a mobile presence from scratch, or reassessing an existing one, working with specialists can accelerate the process significantly. Our practical guide to app marketing agencies covers what to look for and what to avoid when bringing in external expertise.

How Do You Measure SMS Marketing Effectively?

Measurement is where a lot of SMS programmes fall apart, not because the data is not there but because teams are measuring the wrong things or measuring them in isolation.

The metrics that matter most are:

Delivery rate. The percentage of messages that were successfully delivered. If this is low, you have a list quality problem. Old numbers, invalid contacts, and carrier filtering all reduce delivery rates.

Click-through rate. For messages that include a link, what percentage of recipients clicked? This is your primary engagement signal for promotional messages. Track this over time and by segment to understand what is resonating.

Conversion rate. Of those who clicked, how many completed the desired action? This requires proper UTM tagging and attribution, which is where many programmes fall short. If your SMS links are not tagged, you are flying blind on the commercial value of the channel.

Opt-out rate. The percentage of recipients who unsubscribe after each send. A healthy programme should see this below 1% per send. Rising opt-out rates are an early warning signal that something is wrong: frequency too high, relevance too low, or both.

Revenue per message. For e-commerce and retail, this is the number that ties everything together. How much revenue is each message generating on average? This allows you to compare SMS against other channels on a like-for-like commercial basis and justify investment decisions.

I have judged the Effie Awards, and one thing that consistently separates strong entries from weak ones is the quality of measurement thinking. Brands that win are not just reporting channel metrics in isolation. They are showing how channel activity connects to business outcomes. That discipline applies to SMS as much as any other channel. Mailchimp’s SMS marketing guidance for retail covers measurement frameworks that are practical and commercially grounded.

For broader attribution context, particularly if SMS is one of several mobile touchpoints, the analytics thinking in our mobile marketing analytics deep dive is worth reading alongside this.

What Are the Common SMS Marketing Mistakes Worth Avoiding?

After years of reviewing marketing programmes across dozens of industries, the same mistakes appear with depressing regularity. None of them are complicated. Most of them are avoidable with basic discipline.

Sending too frequently. The most common mistake. SMS is a high-attention channel, which means it is also a high-fatigue channel. Most brands should be sending fewer messages, not more. If you are sending more than four to six promotional messages per month to the same subscriber, you are almost certainly past the point of diminishing returns for most audiences.

Ignoring time zones. Sending a promotional message at 6am or 11pm because your scheduling tool defaults to a single time zone is an amateur mistake with professional consequences. Customers notice. Opt-outs follow.

No segmentation. Sending the same message to your entire list treats all customers as identical, which they are not. A customer who bought last week should receive a different message than someone who has not purchased in six months. Segmentation is not optional if you want to take the channel seriously.

Links that do not work on mobile. This sounds basic, but I have seen it more times than I should have. An SMS message that links to a page that is not mobile-optimised is not just a wasted send. It is an active demonstration that you have not thought about the customer experience. Test every link on a real device before sending.

No testing programme. The brands that improve their SMS performance over time are the ones that test systematically: different send times, different offers, different copy approaches, different segmentation logic. Without testing, you are not learning, and without learning, you are not improving. If you want to understand how testing principles apply across mobile channels, the approach covered in our piece on app store optimisation techniques translates well to SMS testing methodology.

Treating SMS as a broadcast channel. The brands that get the most from SMS think of it as a conversation channel, not a broadcast one. That means using two-way messaging where it makes sense, personalising based on behaviour, and treating each message as part of an ongoing relationship rather than a one-off transaction.

How Does SMS Compare to Other Mobile Marketing Channels?

Comparing channels is always a bit of a fool’s errand if the comparison is not grounded in a specific objective. SMS is not better than email, or push notifications, or paid mobile advertising in the abstract. It is better for specific jobs in specific contexts.

Where SMS has a genuine structural advantage is in immediacy and reach. It does not require an app to be installed. It does not require an email client to be open. It arrives in a space that people check frequently and with high attention. For time-sensitive communications, that is a significant advantage.

Where SMS has a structural disadvantage is in richness. You cannot embed images, video, or complex layouts in a standard SMS message. MMS extends this somewhat, but at higher cost and with more variable delivery. If your message requires visual context or detailed explanation, SMS is probably not the right primary channel.

Paid mobile advertising, particularly through platforms like Google, offers reach and targeting precision that SMS cannot match for acquisition. Our piece on Google mobile ads strategy and execution covers how to think about paid mobile investment in a way that complements rather than competes with owned channel activity like SMS.

For brands with a significant app presence, the relationship between SMS and ASO is worth considering. How you acquire and retain app users affects the quality of your SMS list if app download is part of the opt-in experience. Our guides on how to optimise ASO for better results cover the acquisition side of that equation.

The broader point is that mobile marketing is a system, not a collection of independent channels. SMS works best when it is integrated with the rest of what you are doing, informed by the same data, and measured against the same commercial objectives. Brands that treat it as a separate programme, managed by a separate team, with separate metrics, consistently underperform those that integrate it properly.

If you are building or reviewing your mobile marketing strategy more broadly, the full Mobile Marketing Hub brings together everything from analytics to app strategy to paid channels in one place.

Is SMS Marketing Right for B2B?

The honest answer is: it depends, and most B2B brands have not thought about it carefully enough to know.

SMS in B2B contexts has genuine utility for specific use cases: event reminders, appointment confirmations, webinar follow-ups, time-sensitive alerts for existing customers. These are transactional or near-transactional uses where the message is expected and the value is clear.

Promotional SMS in B2B is harder to justify. The purchase cycles are longer, the decision-making units are larger, and the personal nature of SMS can feel intrusive in a professional context in a way that it does not in consumer marketing. That said, the channel is underused in B2B, and there are brands making it work effectively, particularly in sectors where speed of response matters.

MarketingProfs has covered why mobile marketing has potential in B2B and the questions worth asking before committing to it, which remains a useful framework for thinking through channel fit before investing. Forrester has also explored the state of B2B mobile marketing and where the genuine opportunities lie.

My view is that B2B brands should start with transactional SMS, measure it properly, and then consider whether promotional use cases make sense for their specific audience and sales model. Do not assume it does not work. Do not assume it does. Test it with the same rigour you would apply to any other channel investment.

About the Author

Keith Lacy is a marketing strategist and former agency CEO with 20+ years of experience across agency leadership, performance marketing, and commercial strategy. He writes The Marketing Juice to cut through the noise and share what actually works.

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