How two-way SMS works and why it drives performance

Appetite for SMS is growing, and it’s growing fast. Dotdigital’s latest Global Benchmark Report shows that SMS sends increased by 188% in the US and 77% in Asia-Pacific. At the same time, average click-through rates for SMS climbed to 26%, so they’re now seven times higher than for email. Text messages are short, sharp, and land with immediate impact in the palm of your customers’ hands, making them impossible to ignore. 

But impressive send volumes and click rates only tell half the story; it’s trust that drives customers to convert. Dotdigital’s Customer Trend Index reveals that customers need to trust a brand before they convert, and most customers trust people over brands. Friends and family recommendations jumped from sixth to third as a driver of brand loyalty in a single year. You need to give people a reason to trust your brand, and you can’t do that with brand messaging alone. 

Two-way SMS builds that trust by making your brand feel more human. It lets customers have real conversations with your brand. They can get quick answers to their questions, give immediate feedback on their experiences, and, overall, feel like they’re interacting with people. 

Let’s dive into the benefits of two-way SMS and see how it can help you exceed customer expectations and your own marketing targets. Read on to find out:  

• What two-way SMS is 
• How it works
• The benefits and challenges of launching two-way SMS
• Why it’s good at improving customer experiences
• How you can use it to drive results

What is two-way SMS, and how does it work?

Two-way SMS is simply conversational text messaging. Just like messaging your friends, it lets your audience reply directly to your brand without switching channels or searching for customer support emails or phone numbers.

Whether you’re using a short code (a recognizable 5 or 6-digit number) or a standard long code that looks like an everyday mobile number, two-way SMS is simple to set up. 

There are two types of replies you can offer customers. 

Automated responses

Automated responses handle predictable customer touchpoints. They use specific keywords to prompt a direct response from the recipient, like:

• “YES” to confirm a booking
• “HELP” if they need support 
• “DEAL” to claim an offer

The keyword triggers an automatic, personalized reply straight away, helping to move them on to the next stage of the customer journey.

Open-ended replies 

These are where the most valuable customer conversations happen. Complex questions that need a human response are a team effort, and you can respond, track, and keep every conversation moving across SMS, WhatsApp, and Live Chat in one place in the Dotdigital platform. This makes sure customers get the help they need, without conversations getting lost or delayed.

How does two-way SMS differ from broadcast SMS?

Broadcast SMS is perfect for delivering time-sensitive information fast, especially if a reply isn’t needed, like order confirmations, delivery alerts, or limited-time offers.

Two-way SMS is best for opening a direct line of communication. For example, customers can ask questions, give feedback, or confirm an appointment. It turns a message into a conversation and gives your team insight that broadcast SMS can’t give you, like:

• What people are asking
• Where they’re getting stuck
• What’s driving them to act 

Where two-way SMS adds real value

With two-way SMS, you get something most other channels can’t offer: clear and direct insight into what customers think, need, and want. Click-through rates sit around 26% — seven times higher than email, proving that your messages are seen and acted on. But, some of the less obvious wins can often be the most valuable, like: 

• Data you can actually use: Every response is a signal that reveals intent, context, and where customers are in their journey 

• Faster customer support: Instead of hunting for customer support contact details, customers can reply to a message for quick answers and friction-free resolutions 

• Instant and effortless feedback: Short surveys and feedback prompts help you find out what’s working and where improvements are needed

• Personal customer journeys: Automate and segment SMS messages to make sure the right message reaches the right person, and because customers can reply, it feels like a conversation rather than a broadcast

• Clear return on investment(ROI): Pay for messages that almost always get seen by a highly engaged, opted-in audience — the ROI case makes itself

The challenges of using two-way SMS and how to overcome them

No channel is perfect, but the challenges of two-way SMS are manageable once you know what to expect and how to handle them.

High message volumes

Opening yourself up to conversational marketing means a lot more people will engage with your brand, which could result in more conversations to manage.

Dotdigital top tip

You can manage this by automating FAQs, setting up keyword replies, and triaging anything complicated to your support team.

Expectation for speedy replies

Using a channel like SMS that is more conversational, your audience might get frustrated if your replies aren’t instant.

Dotdigital top tip

As with most marketing, automation is the solution again. Make sure you build automated messages that set expectations on reply times so no one is frustrated.

SMS word limits

Like one-way SMS, you’re limited to 160 characters per message. If you have a big message you need to share, it might have to be split into two or three messages, increasing send costs. 

Dotdigital top tip

Keep every message clear and to the point. Dotdigital’s AI editing tools can help you refine copy to fit the character limit. And, if you need more space, WhatsApp is a good alternative for longer, more detailed conversations without character limits.

Compliance and data privacy

Opt-in and opt-out processes are non-negotiable, but they don’t need to be hard.

Dotdigital top tip

Make sure opt-in and opt-out flows are set up correctly from the start. You can also work with your SMS provider or legal team to confirm requirements for each region you operate in.

Examples of using two-way SMS campaigns

Here are some ways marketers are already using two-way SMS to turn messages into conversations.

• Customer support: “Text HELP for your order status”. This is a quick way to handle common questions without customers waiting on hold

• Appointment reminders & confirmations: “Reply 1 to confirm, 2 to reschedule.” This can reduce things like no-shows and cut down on admin for your team

• Promotions: “Reply BUY to claim the deal and get the link instantly.” This can turn interest into immediate action

• Loyalty programs: “Text POINTS to check your status. Reply CLAIM to redeem rewards.” This gives customers a quick way to engage with your rewards program

• Flash surveys or NPS checks: “How did we do today? 1 = great, 2 = fine, 3 = poor.” “We’re sorry you were unhappy with your experience today. Please let us know how we can do better.” Follow-ups can be triggered instantly based on their response to close the loop in real time

• Open conversations that lead to sales: “Do you have a similar t-shirt in green?” “Absolutely, check out this link.” A simple way to move from question to purchase without friction

All of these examples work even better when you hook SMS up to other channels like email or WhatsApp, especially if you can manage them together in your marketing automation platform.

How to implement two-way SMS

When it’s set up properly, two-way SMS becomes just another part of your connected customer experience, quietly running in the background and helping drive results. Follow these seven steps to open a direct communication channel with your customers: 

1. Define your audience and set your goal: Know who you’re talking to and what you want to achieve, like driving engagement, increasing sales, or reducing no-shows

2. Decide what role SMS will play: Different messages work better on different channels — SMS is an open communication channel for customers, but if you want to send longer messages with emojis and media files (like images and PDFs), WhatsApp might be a better option

3. Choose the right SMS platform: Think about what you need today and in 12 months. Features like real-time replies, automation, and cross-channel support are going to be important as the channel grows

4. Set up your number and keywords: Decide whether you’re going to use a dedicated short or long number for your SMS marketing, and make it easy for people to reply by building simple keyword triggers 

5. Build out your flows: Automate what you can and make sure there’s a clear path for your team to step in when your customers need real-time, human support

6. Test everything before you send: Send test SMS messages, check your flows and triggered responses, and make sure it all makes sense for the customer journey

7. Launch, monitor, improve: Once live, use the reporting dashboard in your SMS platform to track SMS campaign ROI and keep optimizing

Tips for using two-way SMS effectively

• Keep messages short, clear, and actionable; every text should serve a clear purpose

• Segment your audience for more relevant conversations

• Let automations handle the basics, but be ready with human replies for anything outside the script for a more tailored experience

• Track things like response rates, survey results, and booking confirmations so you can tweak based on what moves the needle

• Sync with your other marketing channels; SMS is even more effective when it’s part of a bigger cross-channel strategy

Compliance: opt-in and double opt-in

Before you text anyone, you need to get permission. It’s non-negotiable, not just because it’s the law, but because clean, opted-in marketing lists perform better. Make sure every customer has actively opted in, and use double opt-in to keep your list clean and compliant.

Make opting out easy

Every message should include a clear way for people to unsubscribe, like “Reply STOP to unsubscribe”. If it’s easy to join, then it should be just as easy to leave.

Stay aligned with the rules

SMS regulations like TCPA, GDPR, and local requirements vary by region. This is where having the right guidance or support really matters.

Dotdigital helps you manage consent, preferences, and data handling in one place, so you can stay compliant without overthinking the setup. Our team will make sure everything is set up correctly from the start.

Key takeaways

Two-way SMS helps you build real-time conversations that bring you closer to your audience. Marketers who use it see things like:

• Higher engagement
• Spend less on wasted messages
• Deliver faster support
• Get the kind of data that drives better campaigns

And getting started is easy. When SMS sits alongside your email and WhatsApp channels in Dotdigital, you can manage everything in one place and build more connected customer journeys without adding extra complexity.