SMS marketing in B2B: when a text message actually makes sense

SMS marketing is one of the most powerful channels out there: a text message is almost always read, and usually soon after it arrives. But that is exactly why it is also the most intrusive channel you have. In B2B, SMS is rarely your main channel. It is a sharp instrument for one thing: time-sensitive messages to people who already gave permission. In this article you will read why SMS gets such high open rates, when it does and does not make sense in B2B, and why opt-in and GDPR in Belgium are not an optional footnote but the hard condition.

Do the math yourself: calculate what a single lead is worth with our free Value-per-lead calculator.

What is SMS marketing and why does it get such high open rates?

SMS marketing is sending short text messages to customers or contacts who gave permission for it. No image, no formatting, just a few lines of text that arrive directly on the device. An SMS is limited to 160 characters, so your message has to hit home right away.

The numbers behind SMS are striking, though they deserve a caveat. Text messages are often cited with an open rate of around 98%, far higher than average email open rates; that direct character is exactly what sets SMS marketing apart from email. Important to know: that figure is not a hard measured number. Unlike email, an SMS cannot technically measure opens (there is no tracking pixel), so that 98% is in practice more of an estimate based on delivery rates than a proven open rate. What is certain is the high attention value: an SMS does not land at the bottom of an overflowing inbox, but triggers a notification that people usually see quickly. That explains why SMS works for time-sensitive messages.

But that same strength is the risk. An email that is not relevant disappears silently. An SMS that is not relevant feels like an intrusion. You literally borrow space in someone’s personal message stream, next to family and colleagues. That explains why our advice is short: use SMS sparingly and only where timing truly matters. Use it wrong and you damage the relationship faster than through any other channel.

Does SMS marketing even work for B2B?

Most of what you read about SMS marketing is about webshops and B2C: discount codes, sales, low-stock alerts. We are not a webshop, and most B2B companies are not either. So the question is not “does everyone do it”, but “where, in a business context, does it add something that email does not”.

The answer comes down to one word: timing. SMS is at its best when a message needs to be seen immediately and tolerates no delay. In B2B that concretely means:

• Appointment reminders. A short SMS a day or an hour before a meeting, demo or intake demonstrably lowers no-shows. This is by far the strongest B2B use case.
• Event and webinar reminders. “Your webinar starts in an hour, here is the link.” People who signed up and forgot, you still bring in this way.
• Time-sensitive operational updates. A rescheduled appointment, an urgent status, a deadline expiring today. Things that cannot wait until someone reads their mail.

What SMS is not for in B2B is cold outreach. An unsolicited sales SMS to a business number is not only legally problematic (see below), it is also simply counterproductive. You burn a contact before it even became a conversation. Cold leads you warm up with content and patience, not with an SMS notification. How that does work you can read in our piece on lead nurturing.

Can you just send a marketing SMS in Belgium?

No. And this is not a detail you can ignore. In Belgium and across the entire EU, the GDPR applies, along with specific rules around unsolicited electronic communication. The starting point is opt-in: you may only send a marketing SMS after someone has explicitly and demonstrably given permission for it.

A few things people often misjudge:

• “It’s a business number, so it’s allowed.” Not automatically. A person’s mobile number, even in a professional context, is personal data. Without valid consent for SMS marketing you are in the wrong.
• “They did give their number on the form.” Leaving a number for a demo or contact request is not consent to receive marketing texts. Consent must be specific to that purpose.
• “We have their email consent.” Opt-in for email does not cover SMS. They are separate channels with separate consent.

So what should you do? Ask for consent explicitly and for the right purpose, explain what people can expect (what kind of messages, how often), and make unsubscribing dead simple. “Text STOP to unsubscribe” belongs in every message. Identify your company in every SMS, because not everyone has saved your number. And neatly record when and how someone gave opt-in, so you can prove it.

Good news: for the three B2B use cases above you often already have a natural basis. Someone who books an appointment or signs up for your webinar can be asked in that same process to receive reminders via SMS. That consent is logical, expected and easy to give. How to set that up neatly belongs in your broader approach around marketing automation.

How do you fit SMS into your broader B2B approach?

SMS is an addition, not a replacement. It works best as one layer within a well-thought-out marketing automation setup, where email does the heavy lifting and SMS picks up the moments where immediacy counts. A few working rules we apply:

• Limit frequency strictly. In SMS, less really is more. Too many messages chase people away and toward the unsubscribe button. Reserve SMS for the truly important.
• One message, one action. 160 characters force you into clarity. One reason to send, one clear next step.
• Let the trigger do the work. An appointment reminder should be coupled to the booking, not sent manually. That is exactly what marketing automation tools handle for you.
• Combine with your email flows. An SMS reminder on top of an email sequence reinforces, provided they complement rather than repeat each other. You see that same principle in a good drip campaign.

And the most important rule remains: steer on customers and revenue, not on messages sent. A high open rate is nice, but it is not a goal. The goal is that people show up to your appointment, attend your webinar or respond in time. Measure SMS on what happens afterward, not on the notification itself.

When are you better off skipping SMS marketing?

Honest advice is part of it: for many B2B companies SMS is simply not needed. You are better off skipping it when:

• You have no valid opt-in. No consent means no SMS. Full stop. Then invest first in a healthy, consent-based list.
• Your messages are not time-sensitive. If an email suffices, use email. Deploying SMS for something that can wait is wasting the channel’s sharpness.
• You do not yet have a working email base. SMS is the cherry, not the cake. Without solid email and nurturing flows, SMS solves nothing.
• You see it as an acquisition channel. For finding new leads, SMS is the wrong tool. Other channels are stronger and cleaner at that.

In short: SMS is powerful precisely because it is so direct, but that strength turns against you the moment you deploy it without consent or without reason.

Frequently asked questions about SMS marketing in B2B

How high is the open rate of SMS really? SMS is often cited with an open rate of around 98%, well above email. Do keep in mind that this figure cannot be hard measured: SMS has no open tracking like email, so that 98% is more of an estimate based on delivery than a proven open rate. What is true is that SMS has a high attention value and is usually seen quickly. That makes it ideal for time-sensitive messages, but also risky if you deploy it too often or unsolicited.

May I send a marketing SMS to a business number in Belgium? Not without valid opt-in. Under the GDPR, a personal mobile number is personal data, even in a professional context. You need explicit, demonstrable consent that applies specifically to SMS marketing.

Does SMS marketing work for cold outreach in B2B? No. An unsolicited sales SMS is legally problematic and moreover counterproductive. SMS works for people who already gave permission, not to approach cold contacts.

What are the best B2B applications for SMS? Appointment reminders, event and webinar reminders and urgent, time-sensitive updates. Each time it is about messages that need to be seen immediately by someone who already asked for them.

How often may I send a marketing SMS? As little as possible. In SMS, too much volume quickly leads to unsubscribes and irritation. Reserve the channel for the truly important and let email do the rest.

Ready to use SMS smartly and honestly?

SMS is a powerful channel, but it only works if you use it sparingly, with consent and at the right moments. For most B2B companies that is a narrow but valuable role: fewer no-shows, better webinar attendance, faster responses to what is truly urgent. We are a small team that moves fast and treats channels for what they are, means to deliver customers and revenue, not to score pretty numbers. Want to know whether SMS adds anything for you and how to set it up GDPR-proof? Book your free intake.