SMS marketing is one of the highest-engagement channels available to businesses, with open rates around 98% and click-through rates that run roughly nine times higher than email. But those headline numbers only tell part of the story. The real measure of effectiveness depends on how you structure your campaigns, how well you segment your audience, and whether you stay compliant with tightening regulations around consent.
Open Rates, Click Rates, and Response Rates
The core appeal of SMS is that people actually read the messages. A 98% open rate sounds almost too good to be true, but it reflects the nature of the medium: texts land directly on a phone’s lock screen, and most people check them within minutes. Email, by comparison, averages around a 20% open rate.
Click-through rates tell you how many recipients tapped a link in the message. Across the Americas region, SMS click-through rates average about 22.2%, compared to roughly 2.5% for email. Response rates (people who reply to a text) sit around 45%, versus 6% for email. These numbers make SMS look like a clear winner, but they come with context: SMS lists are typically smaller and more self-selected than email lists, meaning the people on them already have stronger intent.
What SMS Actually Generates in Revenue
Engagement metrics are useful, but revenue is what matters. According to Klaviyo’s 2026 benchmarks across all industries, the average SMS campaign generates $0.32 in revenue per recipient. That might sound modest, but it adds up quickly on a list of thousands. Top-performing brands (the top 10%) earn $2.54 per recipient on campaigns and over $5 per recipient on their best automated flows.
The distinction between campaigns and flows is important. Campaigns are one-time blasts you send to a segment of your list, like a flash sale announcement. Flows are automated sequences triggered by customer behavior, like a welcome series after someone signs up or a reminder after they abandon a cart. Flows account for only about 7.6% of total SMS sends, yet they drive 45.2% of total SMS revenue. That lopsided ratio shows that well-timed, behavior-triggered texts vastly outperform batch sends.
Flows also punch above their weight for acquiring new customers. Nearly two-thirds of SMS flow revenue comes from first-time buyers, compared to just 20% from campaigns. If you’re evaluating whether SMS is worth the investment, automated flows are where the strongest returns live.
How SMS Performs by Message Type
Not all texts are created equal. Order rates (the percentage of recipients who make a purchase) average 1.90% for campaigns and 0.27% for flows. That campaign number is deceptively higher because campaigns are usually sent during promotions when purchase intent is already elevated. Flows, sent continuously to smaller groups, accumulate revenue steadily over time rather than in spikes.
Click rates for automated flows average around 5.6% across all verticals, with top performers exceeding 16%. Campaigns land at a similar average but with less upside at the top end. The takeaway: personalization and timing matter more than volume. Brands that segment their lists carefully and send messages tied to specific customer actions consistently outperform those blasting the same offer to everyone.
Why Consumers Opt In and Out
Understanding what your audience actually wants from text messages helps explain why some brands see strong results and others burn through their lists. Consumers say they opt into business texts primarily for three reasons: appointment or reservation reminders, shipment tracking and order notifications, and discounts or promotions. In other words, people want texts that are either useful (telling them something they need to know) or valuable (saving them money).
The top reason consumers unsubscribe is texting too frequently. Average unsubscribe rates sit between 0.38% and 0.58% per send, which means every message you send costs you a small slice of your list. Send too often with too little value and those losses compound. Most successful SMS programs limit sends to a few messages per week at most, with many brands finding their sweet spot at two to four texts per month for promotional content.
How SMS Compares to Email
SMS isn’t a replacement for email. It’s a different tool for different moments. Email works well for longer content, detailed product education, and nurture sequences where you’re building a case over time. SMS excels at urgency: flash sales, limited-time offers, shipping updates, appointment reminders, and anything where you need the recipient to act within hours rather than days.
The average screen time on smartphones is 4.8 hours per day, which partly explains why mobile-first channels see such strong engagement. A text message meets people where they already are. But that immediacy cuts both ways. An email sitting unread in an inbox is invisible. A text message that interrupts someone at the wrong time feels intrusive, which is why frequency discipline and relevance are non-negotiable for long-term list health.
Legal Requirements You Need to Follow
SMS marketing effectiveness depends partly on deliverability, and deliverability depends on compliance. The Telephone Consumer Protection Act (TCPA) sets the federal rules in the United States, and they’ve gotten stricter recently.
For promotional or marketing texts, you need prior express written consent before sending anything. That means the recipient must take an affirmative opt-in action (a pre-checked box doesn’t count), you must clearly disclose what they’re consenting to, you must identify yourself as the sender, and you must state that consent is not a condition of making a purchase. You also need to keep a documented record of when, where, and how each person gave consent.
Transactional messages like shipping confirmations or appointment reminders require a lower standard: prior express consent, which can be verbal or written, as long as the person shared their phone number in a context related to the communication.
A major rule change took effect in January 2026: consent can no longer be shared across brands or sold to third parties. Each business must obtain its own consent from each consumer directly. This closes what was known as the lead-generator loophole and significantly affects affiliate marketing programs and multi-brand operations.
Every marketing text must include an opt-out mechanism, typically “Reply STOP to unsubscribe.” But as of April 2025, businesses must honor opt-out requests made through any reasonable method, not just keyword replies. That includes opt-outs sent by email, voicemail, or even informal language like “please stop texting me.” You have 10 business days to process the request, though real-time processing is the standard best practice. A confirmation message (with no promotional content) must go out within five minutes.
Violating these rules carries real financial risk. TCPA lawsuits can result in damages of $500 to $1,500 per unsolicited message, and class actions in this space are common.
When SMS Marketing Works Best
The brands that get the strongest results from SMS share a few characteristics. They use automated flows for their highest-value messages, sending behavior-triggered texts to the right person at the right time rather than relying solely on batch campaigns. They keep frequency low enough that unsubscribe rates stay manageable. They segment their lists so that a customer who just bought running shoes isn’t immediately getting a promotion for running shoes. And they treat SMS as a complement to email and other channels rather than a standalone strategy.
The data supports a clear picture: SMS is highly effective for short, timely, action-oriented messages sent to an audience that has genuinely opted in. The channel’s strengths (immediacy, visibility, high engagement) are also its constraints. You have limited space, a low tolerance threshold from recipients, and strict legal requirements. Brands that respect those boundaries consistently see strong returns. Those that treat SMS like a louder version of email tend to burn through their lists and their goodwill.