SMS marketing is the practice of sending text messages to customers and prospects who have given explicit consent to receive them. These messages can be promotional, transactional, or conversational — and because they land directly in the recipient's native messaging app, they bypass the algorithm filtering and spam folders that limit other channels. This guide covers how SMS marketing works, how it compares to alternatives, and what it takes to launch a compliant program.
What Is SMS Marketing?
At its core, SMS marketing uses text messages to communicate with an audience that has opted in. Messages fall into three broad categories: promotional (sales, offers, product launches), transactional (order confirmations, shipping updates, appointment reminders), and conversational (two-way support chats and feedback collection).
Unlike email or social media, SMS reaches the recipient's default messaging app with no app download required and no algorithmic filtering in the way. This directness is reflected in widely cited engagement benchmarks: open rates around 98% and average response times under three minutes.
How SMS Marketing Works
The mechanics are straightforward. A business collects phone numbers through opt-in methods — web forms, keyword-to-shortcode, or point-of-sale signups — stores them in a sending list, and dispatches messages through an SMS platform that connects to carrier networks via providers such as Twilio, Infobip, or similar aggregators.
The Technical Flow
| Step | What Happens |
|---|---|
| 1. Opt-in | Customer consents via web form, keyword text, or checkout checkbox |
| 2. Storage | Phone number and consent record are stored in your SMS platform |
| 3. Composition | You write the message, select the audience, and schedule the send time |
| 4. Routing | The platform sends via an SMS aggregator to the appropriate carrier network |
| 5. Delivery | The carrier delivers the message to the recipient's phone and returns a delivery receipt |
| 6. Engagement | The recipient reads, clicks links, or replies — and the platform tracks each action |
Why SMS Marketing Outperforms Other Channels
SMS consistently posts stronger engagement numbers than email, push notifications, and social media across the metrics that matter most to marketers.
- ~98% open rate — compared to 20–25% for email. Nearly every text gets read.
- ~36% click-through rate — SMS links are clicked at roughly 5–10× the rate of email links.
- 90-second average response time — most texts are read within three minutes of delivery.
- No algorithm gating — unlike social media, your message reaches every opted-in subscriber.
- ~99% delivery rate — when properly configured with 10DLC registration and compliant content.
Types of SMS Marketing Messages
Promotional Messages
Sales, discounts, product launches, and event invitations. These are the primary revenue drivers. A typical example: "Flash sale: 30% off all items through midnight. Shop now: [link]"
Transactional Messages
Order confirmations, shipping notifications, appointment reminders, and password resets. Because recipients are expecting these messages, they tend to see even higher open rates than promotional sends.
Conversational / Two-Way Messages
Support conversations, feedback collection, and surveys. Two-way SMS allows customers to reply directly, turning what would otherwise be a broadcast channel into a dialogue.
SMS Marketing vs. Other Channels
| Channel | Open Rate | Click Rate | Avg. Response Time | Reach |
|---|---|---|---|---|
| SMS | ~98% | ~36% | 90 seconds | Every mobile phone |
| 20–25% | 2–5% | Hours to days | Inbox (if not filtered to spam) | |
| Push Notifications | 5–15% | 1–3% | Minutes | App users only |
| Social Media | Varies | 0.5–2% | Hours | Algorithm-dependent |
Getting Started with SMS Marketing
Launching an SMS program requires four foundational elements: a platform, a sending number, an opt-in mechanism, and compliant content.
- Choose an SMS platform — Look for one that handles number provisioning, compliance management (including automatic opt-out processing), link tracking, and audience segmentation. Trackly SMS covers all of these.
- Register your sending number — In the United States, you need a 10DLC-registered number or a short code. Your platform should guide you through the carrier registration process.
- Build your subscriber list — Use web forms, keyword opt-ins, or checkout integrations. Never purchase lists — doing so violates the TCPA and will likely result in your number being blocked by carriers.
- Send your first campaign — Start with a welcome message to new subscribers, then layer in promotional campaigns. A/B test messaging and timing from the outset.
SMS Compliance Fundamentals
SMS marketing is regulated. The two primary frameworks businesses in the US must follow are the TCPA (Telephone Consumer Protection Act) and carrier-level 10DLC registration.
- Explicit consent required — You must obtain written consent before sending any marketing message. There are no exceptions.
- Easy opt-out — Every message must honor STOP replies and provide a clear path to unsubscribe.
- 10DLC registration — All business-to-consumer SMS in the US requires registering your brand and use case with carriers.
- Quiet hours — Many jurisdictions prohibit marketing texts before 8 AM or after 9 PM in the recipient's local time zone.
Non-compliance carries significant financial risk: TCPA violations can result in penalties of $500–$1,500 per message. A well-built SMS platform handles opt-out processing and compliance guardrails automatically, reducing this exposure.
Key Metrics to Track
- Delivery rate — The percentage of messages successfully delivered to handsets.
- Click-through rate (CTR) — The percentage of delivered messages in which the recipient clicked a link.
- Opt-out rate — The percentage of recipients who unsubscribe after a given message. Staying under 2% per campaign is generally considered healthy.
- Revenue per message — Total attributed revenue divided by the number of messages sent.
- Cost per segment — Messages exceeding 160 characters are split into multiple segments, each billed separately. Monitoring this helps control spend.
High-performing SMS programs combine strong deliverability, thoughtful segmentation, and continuous A/B testing to steadily improve revenue per message over time.
If you're evaluating platforms or ready to send your first campaign, learn more about how Trackly SMS can help.