What Is SMS Marketing? A 2026 Guide
What SMS marketing is, why texts outperform every other channel, the best practices, and how to do it without annoying your customers.
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Last updated: June 2026 · Written by the CRMReviews team
SMS marketing is the quiet overachiever of digital channels: almost everyone opens a text, and most do so within minutes. Sent well - to people who opted in, at a sensible frequency - it delivers some of the highest engagement and ROI in marketing. This guide explains what SMS marketing is, why it works so well, and how to do it right.
Key takeaways
- SMS marketing sends promotional or transactional texts to subscribers who have opted in.
- SMS boasts 90-98% open rates and a 45%+ response rate, far above email.
- 90% of texts are read within 3 minutes - near-instant reach.
- ROI averages $21-$71 for every $1 spent.
- Get it right with consent, brevity, sensible frequency and clear opt-out (GDPR in the UK).
What is SMS marketing?
SMS marketing is the practice of sending promotional or transactional text messages to subscribers who have opted in. Businesses use it for sales announcements, abandoned-cart recovery, appointment reminders, product updates and time-sensitive alerts. Because it lands directly on the phone people carry everywhere, it gets seen almost instantly.
Why SMS works so well
- Sky-high open rates - 90-98% of texts are opened, versus a fraction of emails.
- Instant reach - 90% are read within three minutes.
- Strong ROI - $21-$71 returned per $1, especially when automated.
- Universal - every mobile phone receives texts, no app or data needed.
Common uses
- Promotions - flash sales and offers.
- Abandoned cart - recover lost sales at peak intent.
- Reminders - appointments and bookings, cutting no-shows.
- Alerts - order updates and time-sensitive news.
SMS marketing best practices
- Get proper consent - double opt-in is best practice; UK GDPR requires explicit consent and an opt-out in every message.
- Keep it short - within 160 characters (drops to ~70 with emojis).
- Don't over-send - 1-4 promotional messages a month is the sweet spot.
- One clear CTA - tell people exactly what to do and what happens next.
- Identify yourself - start with your business name or sender ID for trust.
- Time it well - mid-to-late afternoon tends to perform best.
SMS vs email
They're complementary, not competing. Email is great for longer content and lower-urgency messages; SMS is unbeatable for short, time-sensitive ones that need to be seen now. The best programmes use both - see our email marketing guide - coordinated through marketing automation and lead nurturing.
Tools for SMS marketing
You'll want a platform that handles consent, sending, automation and replies - ideally one that shares a database with your CRM so SMS can be triggered by behaviour. An all-in-one platform like GoHighLevel includes SMS alongside CRM, email and automation, so a text can fire automatically at the right moment. See our review or the best all-in-one marketing platform guide.
Frequently asked questions
What is SMS marketing in simple terms?
Sending promotional or transactional text messages to people who've opted in - for offers, reminders, cart recovery and alerts.
Why is SMS marketing so effective?
Texts have 90-98% open rates, are read within minutes, and return $21-$71 per $1 spent - far above most channels.
How often should I send marketing texts?
1-4 promotional messages a month is the widely cited sweet spot - more risks annoying subscribers and triggering opt-outs.
Do I need consent to send marketing texts?
Yes - UK GDPR requires explicit consent and a clear opt-out in every message. Double opt-in is best practice.
What's the character limit for an SMS?
160 characters per message, dropping to around 70 if you use emojis or special characters.
SMS, email and CRM in one
GoHighLevel includes SMS alongside CRM, email and automation - so a text fires automatically at the right moment. Try it free for 14 days.
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