What Is SMS Marketing and How to Get Started

Takeaways

• SMS marketing is permission-based text messaging that sends promotions, reminders, and updates to customers who opted in. It succeeds or fails on three things. Deliverability, compliance, and cost at scale.
• SMS open rates far exceed email. Gartner reports open rates as high as 98% for SMS, compared with roughly 20% for email.
• US carriers require 10DLC registration for business messaging on local numbers. Skipping it means carriers block your traffic. TCPA fines come from consent violations, not registration gaps.
• Platform tools like Attentive and Mailchimp trade control for convenience. API-first infrastructure gives you deliverability visibility and volume pricing without a middleman markup, as of 2026.
• You can build a compliant SMS campaign once your 10DLC registration clears, which typically takes 1-5 business days. Working Python code is included below.

Table of contents

• What is SMS marketing?
• Why SMS marketing outperforms other channels
• SMS marketing compliance rules you cannot skip
• How to build an SMS marketing strategy
• Top SMS marketing tools and how to choose
• How to send a bulk SMS campaign with Python
• SMS marketing best practices
• FAQ about SMS marketing

What is SMS marketing?

SMS marketing is the practice of sending promotional and transactional text messages to customers who have given explicit permission to receive them. Businesses use it for flash sales, cart abandonment reminders, appointment confirmations, shipping updates, and loyalty programs. Every message rides on the same 160-character SMS channel people use daily, which is why the channel gets read.

The mechanics are simple. A customer opts in through a web form, a keyword, or a checkout checkbox. The business sends messages from a registered number through a provider like the Telnyx SMS API, which runs on a private, owned network with direct carrier connections. The customer can reply STOP at any time, and the business must honor it immediately.

Text message marketing works for ecommerce stores, clinics, restaurants, logistics companies, and regulated businesses alike. The strategy differs by vertical. The rules do not. Consent first, identification in every message, and instant opt-out handling apply to everyone.

Why SMS marketing outperforms other channels

Email inboxes are crowded and push notifications get silenced, but text messages get read. Gartner reports SMS open rates as high as 98%, compared with roughly 20% for email. Most texts are read within minutes of receipt, which makes SMS the only marketing channel suited to time-sensitive offers.

Speed changes what you can sell. An email about a two-hour flash sale arrives after the sale ends. A text arrives while the sale is live. That is why cart abandonment texts convert and why restaurants fill slow nights with same-day offers.

The channel also has a cost advantage at scale. Per-message rates drop with volume, and Telnyx publishes its messaging pricing publicly, so you can model campaign costs before you send. For a full breakdown of per-message economics, see our guide to SMS Pricing.

SMS marketing compliance rules you cannot skip

Compliance is where most SMS programs fail. The TCPA requires prior express written consent before you send marketing texts to US numbers. Violations carry statutory damages per message, and class actions are common. Consent must be documented, specific, and revocable. A purchased list is not consent. A scraped list is not consent.

US carriers also require 10DLC registration for application-to-person messaging on local numbers. You register your brand and your campaign use case, and carriers vet both before traffic flows. Unregistered traffic gets filtered or blocked. Telnyx documents the full registration process in its messaging compliance requirements.

Beyond consent and registration, honor quiet hours. Federal and state rules restrict marketing texts outside roughly 8 AM to 9 PM in the recipient's local time zone, and some states are stricter. Identify your brand in every message. Include opt-out language in recurring campaigns.

Regulated verticals face extra limits. Dispensary SMS marketing is the sharpest example. Carriers prohibit cannabis promotion over standard A2P routes regardless of state legality, so dispensaries typically restrict texts to transactional content like order confirmations and use compliant loyalty language reviewed by counsel. If you operate in a regulated space, read carrier content policies before you build, not after your traffic gets blocked.

How to build an SMS marketing strategy

A working SMS marketing strategy follows six steps. Skipping any of them costs revenue or invites carrier filtering.

1. Define one goal per campaign. Revenue recovery, repeat purchase, or show rate. A campaign with two goals has none.
2. Build an opted-in list. Collect consent at checkout, through keyword opt-ins, and on web forms. Document every opt-in with a timestamp.
3. Segment before you send. New subscribers, lapsed buyers, and VIPs respond to different offers. Bulk SMS marketing to one undifferentiated list burns your list fast.
4. Write short. One offer, one link, one call to action, under 160 characters where possible. Longer messages split into segments and cost more.
5. Set a cadence and hold it. Two to four marketing texts per month is a common ceiling. More than that drives opt-outs.
6. Measure delivery and conversion. Use delivery tracking webhooks to confirm messages arrived, and tag links to attribute revenue.

For SMS marketing for Shopify stores, the highest-return sequence is simple. Capture opt-in at checkout, send a welcome message with a first-purchase discount, trigger a cart abandonment text one hour after abandonment, and follow with a shipping confirmation. Those four automated messages typically outperform any manual campaign calendar because they fire at the moment of intent.

Top SMS marketing tools and how to choose

SMS marketing software falls into two camps. Platform tools like Attentive and Mailchimp give marketers a point-and-click interface with templates, list management, and prebuilt Shopify integrations. API-first infrastructure like Telnyx and Twilio gives developers programmatic control over sending, routing, and delivery data. The right choice depends on who runs the program and how much volume you send.

Platform tools work well for small lists and teams without engineering support. The tradeoffs show up at scale. You pay a subscription plus a per-message markup, you cannot see raw delivery data, and your sending logic lives inside someone else's product roadmap.

API-first infrastructure inverts that. You control the sending logic, you see every delivery receipt, and you pay published per-message rates that drop with volume. Among API providers, architecture matters as of 2026. Telnyx owns its telephony network and holds direct carrier relationships, while most competitors resell aggregator routes. Fewer hops means fewer points of failure between your campaign and the handset, and unified billing keeps SMS, voice, and number costs on one invoice. For a deeper look at the sending mechanics, see our Send SMS API guide.

How to send a bulk SMS campaign with Python

The fastest way to evaluate mass texting for business is to send a real campaign. You need three things. A Telnyx account with an API key, SMS-capable phone numbers assigned to a messaging profile, and a completed 10DLC registration for US traffic.

The Flask application below accepts a list of opted-in recipients and sends a campaign message to each through the Telnyx send message endpoint.

import os
from flask import Flask, request, jsonify
import telnyx

app = Flask(__name__)
telnyx.api_key = os.environ.get("TELNYX_API_KEY")

@app.route("/send-campaign", methods=["POST"])
def send_campaign():
    data = request.json
    results = []
    for recipient in data["recipients"]:
        response = telnyx.Message.create(
            from_=data["from"],
            to=recipient,
            text=data["text"]
        )
        results.append({"to": recipient, "message_id": response.id})
    return jsonify({"sent": len(results), "messages": results})

if __name__ == "__main__":
    app.run(port=5000)

Point a webhook at your server to receive delivery receipts for every message, then suppress any number that replies STOP before your next send. Both steps are covered in the production-ready examples Telnyx maintains on GitHub. The bulk SMS example covers high-volume sending, and the campaign example adds list management and campaign structure.

SMS marketing best practices

The programs that survive carrier filtering and keep subscribers share the same habits.

• Get explicit written consent before the first marketing message, and store proof of it.
• Identify your brand in every message. Recipients should never guess who is texting.
• Honor STOP instantly and automatically. Suppression must happen before the next send, not during a weekly cleanup.
• Keep messages under 160 characters where possible. Shorter messages cost less and read better.
• Send between 8 AM and 9 PM in the recipient's local time, and check state rules that narrow that window.
• Test send times and offers against segments, then measure with delivery webhooks rather than assumptions.
• Watch your opt-out rate per campaign. A spike means your cadence or your targeting is wrong.

Deliverability is the metric under all of these. A campaign that carriers filter earns nothing regardless of how well it was written. Registered traffic, clean lists, and consistent sending patterns keep your messages on the fast path to the handset.

FAQ about SMS marketing

Pricing and feature comparisons are based on publicly available information as of 2026 and are subject to change. Contact Telnyx for current SMS pricing tailored to your use case and volume.