Email marketing has an average open rate of 20%. SMS sits at 98%, with 90% of messages read within three minutes of receipt. Yet most small business operators have never sent a single text campaign. The gap between awareness and action comes down to two concerns. Compliance risk and setup complexity. Both are solvable problems with a defined framework.
The compliance concern is legitimate. TCPA violations carry fines of $500 to $1,500 per message sent to an unconsented recipient. A list of 2,000 contacts without proper opt-in documentation is not a marketing asset, it is a liability. But a properly consented SMS list of 500 people who actually want your messages outperforms an email list of 5,000 unengaged subscribers in every measurable way.
Channel ROI Comparison: SMS vs. Email vs. Paid Social
Average Revenue per 1,000 Messages Sent
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SMS Platform Comparison
| Platform | Best For | Price/mo | Msgs Included | TCPA Tools | Key Feature |
|---|---|---|---|---|---|
| SimpleTexting | Small business general use | $39+ | 500 | Opt-in tracking | Drag-and-drop campaigns |
| Podium | Local businesses, reviews + SMS | $399+ | Unlimited | Full compliance | Review generation built-in |
| Klaviyo SMS | eCommerce, SMS + email combo | $20+ add-on | Usage-based | Full compliance | Behavioral triggers |
| Twilio | Custom-built workflows, developers | Pay-as-you-go | $0.0079/msg | Manual setup | Full API control |
| SlickText | Retail, loyalty programs | $29+ | 500 | Keyword opt-in | Text-to-win campaigns |
How to Launch a Compliant SMS Marketing Program
- Build consent before you send a single message. TCPA requires prior express written consent for marketing texts. This means a checkbox on your website opt-in form, a keyword opt-in (“Text DEALS to 55555”), or a point-of-sale opt-in with documented consent records. Purchase a “list”. From any source and you inherit unlimited liability for every message sent. There is no workaround.
- Set up your keyword and opt-out infrastructure. Every SMS marketing program must honor STOP, UNSUBSCRIBE, QUIT, CANCEL, END, and HELP commands automatically. Configure these before you send message one. Test them. Failing to honor an opt-out within 10 days is a per-message TCPA violation.
- Segment your list before your first campaign. A list of 500 customers is not one audience. Segment by purchase history (recent buyers vs. lapsed), average order value, and product category. A 15% discount offer sent to your highest-value customers who buy at full price trains them to wait for promotions. Segment first, offer second.
- Write messages under 160 characters. Messages over 160 characters split into multiple segments and get billed as multiple messages. They also display differently on some carriers. Draft in a character counter. The discipline of 160 characters forces clarity that makes messages more effective, not less.
- Send at the right time. TCPA restricts marketing messages to 8am–9pm in the recipient’s local time zone. Practically, the highest response rates for retail and services are Tuesday through Thursday between 10am and 2pm. Avoid Mondays (low engagement) and after 7pm (opt-out spikes). Time your sends in your platform scheduler, not manually.
- Track unsubscribe rate as your primary health metric. A healthy SMS program runs an unsubscribe rate below 2% per campaign. Above 3% means your list does not want what you are sending, your frequency is too high, or your segmentation is wrong. Do not treat unsubscribes as a vanity metric, treat them as the bill of health for your list quality.
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Read the SBM guide to email marketing for small business, how to build the channel that feeds your SMS list.
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Frequently Asked Questions
Is SMS marketing legal for small businesses?
Yes, with proper consent. The Telephone Consumer Protection Act (TCPA) requires prior express written consent before sending marketing text messages. This means customers must affirmatively opt in, pre-checked boxes, assumed consent, or purchased lists do not qualify. With documented opt-in consent, a robust STOP/HELP response system, and sends confined to 8am–9pm local time, SMS marketing is fully legal and well within reach for any small business.
How much does SMS marketing cost per month?
Most small business SMS platforms charge $29–$99 per month for 500–2,000 messages, plus per-message fees for overages ranging from $0.01 to $0.02 per text. A business sending two campaigns per month to a list of 400 contacts would spend approximately $50–$80 per month all-in. That cost per message is the lowest of any direct marketing channel except email.
What is the difference between promotional and transactional SMS?
Transactional SMS messages, appointment confirmations, shipping notifications, order receipts, do not require marketing opt-in consent under TCPA. They have a direct relationship to a transaction the customer initiated. Promotional SMS, sales, discounts, new products, loyalty offers, requires explicit marketing consent. Many small businesses start with transactional SMS (often embedded in their POS or booking system) before building a separate marketing list.
How do I build an SMS list from scratch?
The four most reliable list-building methods for small businesses are. (1) keyword opt-in at point of sale (“Text VIP to 12345 for 10% off your next visit”). (2) website pop-up or form with SMS checkbox separate from email, (3) receipt or invoice opt-in with documented consent, and (4) loyalty program enrollment. Avoid importing existing customer email lists into SMS, phone number possession does not constitute SMS marketing consent.
What is a good open rate for SMS marketing?
The SMS open rate benchmark of 98% reflects the percentage of messages that are opened, not that result in a click or conversion. A realistic click-through rate for a well-segmented SMS campaign is 8–15%. Conversion rates depend heavily on the offer and the quality of your list, but 2–5% is a reasonable target for promotional campaigns. Track revenue per message sent (target. $1.50–$3.00 per message) rather than open rate alone as your primary performance metric.
Should I use SMS and email together?
Yes, the highest-performing small business marketing stacks use SMS and email as complementary channels, not substitutes. Email works best for longer-form content. Newsletters. Product launches, detailed offers. SMS works best for time-sensitive, high-urgency messages: flash sales, appointment reminders, event day reminders, and abandoned cart recovery. A common workflow is to send an email campaign, wait 24 hours, then send an SMS reminder to non-openers. This typically lifts campaign conversion 30–50% over email alone.
