In the world of digital marketing, small details can make a huge difference. Whether it’s a single word in your message or the time it lands on your customer’s phone, these factors can determine whether your campaign succeeds or fails. That’s where testing SMS campaigns through A/B testing comes in.

A/B testing, or split testing, allows you to compare two or more variations of a message to see which performs better. It’s a structured, data-driven way to refine your SMS strategy and make informed decisions based on results, not assumptions.

In this guide, we’ll break down everything you need to know about testing SMS campaigns, including how to experiment with message content, timing, and creative approaches to boost engagement and conversion rates.

What is A/B testing in SMS?

A/B testing in SMS is the process of sending two or more variations of a text message to different segments of your audience and analysing which version performs better. The goal is to optimise performance, whether that’s higher click-through rates, increased responses, or more conversions.

When testing SMS, you might change:

• The wording or tone of your message
• The timing of when you send it
• The inclusion of links, emojis, or offers
• The sender’s name or call to action

By testing one element at a time, you can isolate which changes have the greatest impact and apply those insights to future campaigns.

Why testing SMS is essential for marketers

Many marketers rely on intuition or past results to guide their SMS campaigns. But customer behaviour changes constantly. What worked six months ago might not work now. That’s why testing SMS is so valuable, it helps you keep up with audience preferences and industry shifts.

Here are a few key benefits:

1. Improved engagement rate

By identifying what type of messages resonate best, you can craft texts that capture attention and encourage action.

2. Reduced opt-outs

Testing helps you find the right balance between frequency and content. When messages feel relevant, customers are less likely to unsubscribe.

3. Higher ROI

Every text you send costs money. Testing SMS allows you to spend wisely by focusing on approaches that yield the best results.

4. Data-driven decisions

Instead of guessing what works, you can use performance metrics, like click-through rates or conversions, to back up your strategy.

5. Continuous improvement

SMS marketing isn’t a one-time effort. Ongoing testing creates a feedback loop that helps refine your tone, timing, and targeting over time.

Setting up a strong SMS A/B testing strategy

Before you start testing SMS campaigns, you need a solid foundation. A few simple steps can make the difference between clear insights and confusing data.

Step 1: Define your goal

Ask yourself what you want to learn from the test. Are you trying to increase link clicks? Improve engagement? Reduce opt-outs? Clear goals make it easier to measure success.

Step 2: Choose one variable

When testing SMS, focus on one element at a time. If you change multiple things, like both your message content and timing, you won’t know which one caused the result.

Step 3: Segment your audience

Divide your audience into equal groups that share similar characteristics. This ensures your results are fair and unbiased.

Step 4: Set a control and a variant

Your control message is your baseline, the version you’ve used before or expect to perform well. The variant is your new idea.

Step 5: Measure success

Decide which metrics matter most. Common ones include delivery rate, click-through rate, opt-out rate, and conversion rate.

Testing message variants

The message itself is the heart of your SMS campaign. Small tweaks in language or structure can completely change how people respond. Here are the most effective ways to test your message variants.

Tone and language

Try different tones, conversational versus professional, playful versus direct. Some audiences respond better to casual language, while others prefer straightforward communication.

Example A: “Hi Sarah, fancy 20% off your next visit? Tap here to book before Friday!”
Example B: “Sarah, get 20% off your next booking. Offer ends Friday. Click to claim.”

By testing SMS messages like these, you can learn whether your audience prefers friendly messaging or simple, action-focused language.

Personalisation

Including a customer’s name or referencing their past behaviour can make a big difference. Compare a generic version with a personalised one to see which drives more engagement.

Call to action (CTA)

Your CTA determines what happens next. Try testing variations like “Shop now”, “Book your table”, or “Claim your offer”. Sometimes, even changing one word can improve conversion rates.

Emojis and formatting

Visual elements like emojis can add warmth and catch the eye, but overuse may appear unprofessional. Run tests with and without emojis to see which performs better.

Offer structure

Test different ways of presenting your offer. You might compare a percentage discount (“20% off”) with a specific reward (“Save £10”) to see which gets more responses.

Testing SMS send time

Timing is just as important as content. Even the most compelling message can be ignored if sent at the wrong moment. Testing SMS send times helps you determine when your audience is most responsive.

Consider time zones and habits

If your audience spans multiple regions, time zones can affect performance. Test different time slots for each region to find what works best.

Test day of the week

Messages sent midweek may perform better than those sent on Mondays or weekends, but this depends on your industry. For example, restaurants may see better engagement on Fridays, while e-commerce brands might perform best on Sundays.

Test time of day

Try sending messages in the morning versus the evening. For many brands, lunchtime or early evening (around 5–7 p.m.) tends to perform well, but the only way to know for sure is by testing SMS send times for your specific audience.

Analyse engagement patterns

Review your analytics regularly. If you notice high click-through rates during a certain time frame, use that insight to refine future campaigns.

Creative experiments in SMS marketing

Once you’ve mastered message variants and timing, it’s time to get creative. Experimenting with format and style can help your messages stand out in crowded inboxes.

Rich content and links

Try incorporating shortened URLs that lead to personalised landing pages or digital wallet passes. Test whether customers engage more with a message offering a reward link versus one promoting a product.

Two-way messaging

Instead of sending one-way promotional texts, test interactive SMS campaigns that encourage replies. For example, a restaurant might text, “Want 2-for-1 this weekend? Reply YES to claim.” Testing response-based campaigns can reveal new ways to engage customers.

Multi-message sequences

For more complex journeys, test drip sequences, a series of messages sent over a few days. Compare the results of a single message versus a short sequence to see which drives more conversions.

Seasonal and event-based content

Test how timing your messages around holidays, sales events, or cultural moments impacts engagement. Seasonal relevance often improves results, but only consistent testing SMS campaigns can prove it for your audience.

Analysing and learning from your results

Running tests is only half the process. The real value comes from analysing and applying what you learn.

Look beyond one campaign

Don’t rely on a single test. Run multiple rounds to confirm results and identify patterns.

Use statistical significance

Ensure your sample size is large enough to make the data reliable. Small tests can lead to misleading conclusions.

Track key metrics

Focus on more than open rates. Metrics like click-through, conversion, and opt-out rates give a fuller picture of campaign success and testing SMS performance.

Share insights internally

Document your findings so your entire marketing team can benefit. Use your results to refine messaging across SMS, email, and social media.

The future of SMS testing

As technology evolves, testing SMS will become even more sophisticated. AI tools are already helping marketers predict engagement, automate send-time optimisation, and personalise content at scale.

In the future, expect to see:

• AI-driven predictive testing that adjusts campaigns automatically based on live data
• Dynamic content testing that tailors messages in real time
• Cross-channel experiments where SMS testing informs email and app notification strategies

These innovations will make it easier to test and adapt campaigns continuously, ensuring every message performs at its best.

Conclusion

A/B testing isn’t just for email or web pages. When applied effectively, testing SMS campaigns can transform your results, improve engagement, and boost conversions. By experimenting with message variants, send times, and creative approaches, you gain the insights needed to craft more impactful campaigns.

Start small, test often, and use what you learn to keep refining your strategy. The more you test, the more you understand your audience, and the more successful your SMS marketing becomes.

If you’re ready to take your SMS marketing to the next level, contact Text Management today. Our team can help you build smarter, data-driven campaigns and uncover what really drives your audience to engage.