SMS Marketing: Laws, Costs and Scripts for Booked-Call Funnels

SMS marketing is sending text messages to people who opted in to hear from your business: promotions, but also confirmations, reminders and follow-ups. For a high-ticket service business, the money is not in discount blasts. It is in booking a paid lead fast and making sure they show up, with the consent, carrier registration and opt-out handling US rules require.

Most SMS message marketing advice is built for ecommerce: flash sales, cart reminders, promo ideas. If you sell a consulting engagement, a coaching program or a medspa package on a call, you need a handful of texts wired to your calendar, written like a person and compliant enough that one lawsuit does not eat a quarter of profit.

What is SMS marketing?

SMS marketing is the use of text messages (Short Message Service) to reach customers and prospects who agreed to receive them. CTIA, the wireless industry association, publishes Messaging Principles and Best Practices that sort business texts into three types, each with its own level of consent (CTIA Messaging Principles and Best Practices):

So what counts as a marketing SMS message? Any text that promotes a product, service or offer. The line is thinner than most teams think: CTIA notes that adding a sales call to action, like a coupon code, to an informational text can make it promotional. Keep reminders about the appointment and nothing else.

Where SMS earns its keep in a booked-call funnel

Texts are short, personal and land on the buyer's phone. Use them for moments that are urgent and small:

• Speed to lead: the first touch, seconds after an opt-in or application.
• Booking confirmation: date, time, join link, how to reschedule.
• Call reminders: 24 hours and 1 hour before, the two never to skip.
• No-show recovery: a human-sounding text minutes after a missed call.
• Application follow-up: applied but did not book.
• Short reactivation: one question to old leads who gave marketing consent.

Leave the detail to email: agendas, case studies, recaps. Text gets the person to the call. Email makes the call worth attending. The full chain from ad to attended call is in our guide to the booking funnel.

A word on the near-perfect SMS open rates quoted across this search: nobody can measure them. Standard SMS has no read receipt; in Twilio's message statuses, for example, read exists only for RCS and WhatsApp. Treat any SMS open rate as an estimate and manage what you can count: deliveries, replies, clicks, opt-outs, bookings and shows.

Is SMS marketing legal in the US?

Yes. SMS marketing is legal in the US when you have the right consent, honor opt-outs, respect calling hours and register your traffic with the carriers. Below is the working frame. It is a summary, not legal advice: have counsel review your consent language before launch.

Consent under the TCPA

Under the Telephone Consumer Protection Act (TCPA), the FCC treats texts as calls, and its rules at 47 CFR 64.1200 set the consent bar. Marketing texts sent with an autodialer to a mobile number need prior express written consent: a written agreement, signed by the person (electronic signatures count where the law recognizes them), that clearly authorizes the seller to send advertising or telemarketing messages to that number. The agreement must disclose that they are authorizing those messages and that signing is not a condition of purchase (47 CFR 64.1200). Informational texts such as appointment reminders need prior express consent, a lower bar but still a bar. The same rules extend Do Not Call protections and the calling-hour limits to texts sent to wireless numbers.

In practice, that means an unchecked SMS consent box on the form, with language like this:

I agree to receive recurring automated marketing and appointment texts from Acme Advisory at the number above. Consent is not a condition of purchase. Msg frequency varies. Msg & data rates may apply. Reply HELP for help, STOP to opt out. Terms and privacy: example.com/terms

Then keep the receipt. CTIA's list of what to record: the timestamp, how they opted in, the exact language they saw, the campaign, the IP address, the phone number and who consented.

Calling hours and penalties

FCC rules bar telephone solicitations before 8 a.m. or after 9 p.m. in the recipient's local time, and they reach marketing texts to mobile numbers. Some states are stricter: Florida and Oklahoma use a shorter window and cap how many marketing calls or texts one person can get in a day. A safe default is to schedule marketing texts between 8 a.m. and 8 p.m. recipient time. The penalties make caution cheap: the TCPA lets consumers sue for $500 per violation, and a court can triple that for willful or knowing violations (47 U.S.C. 227). Each unlawful text can be its own violation.

STOP, HELP and opt-outs

Under the FCC's revocation rules, a consumer can revoke consent by any reasonable means, and replying "stop," "quit," "end," "revoke," "opt out," "cancel" or "unsubscribe" counts. You must honor it within a reasonable time, no more than 10 business days. One confirmation text is allowed if it carries no marketing, and it is presumed fine if it goes out within five minutes. CTIA asks for the same discipline: act on natural-language opt-outs like "please opt me out," send one final confirmation, then go silent. Answer HELP with your business name and a way to reach a person. And anyone who never opted in can forward your text to 7726 (SPAM), the reporting code that helps carriers spot and block similar messages.

What changed in 2025 and 2026

• One-to-one consent never arrived. The FCC rule that would have limited each consent to a single seller was vacated by the Eleventh Circuit before it took effect, and the FCC has since removed it. Consent still has to clearly authorize you as the seller. It does not have to be one checkbox per seller.
• The revocation rules took effect April 11, 2025. The "revoke all" piece, which would have made one opt-out stop every type of automated text from a sender, was delayed to January 31, 2027 (FCC fact sheet and order text).
• The FCC voted to revise it on September 30, 2026. Based on the draft order the FCC published on September 9, an opt-out from one category of informational texts can be limited to that category, an opt-out from any marketing text stops all of your marketing texts, and you may designate an exclusive opt-out method, such as the standard reply keywords, if you disclose it clearly in the text. The final text was not yet published when this was written, and the changes take effect 30 days after it appears in the Federal Register, so check the final order before you change your opt-out handling. A companion proposal asks whether to shorten the 10-business-day deadline and require two-way texting.

Operator translation: process STOP keywords automatically, have a human catch everything else ("take me off your list"), treat an opt-out from any marketing text as an opt-out from all marketing, and disclose STOP in your texts.

State laws and carrier registration

Federal law is the floor. Florida's telemarketing law counts texts as telephonic sales calls and now requires a consumer to reply STOP, and give the sender time to comply, before suing over texts. Maryland's law covers texts too. Check the rules in every state you market into.

Then the carriers. Texting from a regular 10-digit number through a platform is A2P 10DLC: your brand and each campaign (use case) must be registered with The Campaign Registry, and brands cannot register directly, so your provider files for you. Unregistered 10DLC traffic gets blocked. Toll-free numbers need their own verification before they can send. For most service businesses, a registered local number is the right default: it reads like a person and supports two-way conversation.

How much does SMS marketing cost?

Less than most people fear, and more than the per-text price suggests. The components, from the public pages of Twilio and of GoHighLevel's LC Phone (priced off Twilio's rates):

Sources: Twilio US SMS pricing and HighLevel's A2P 10DLC fee guide. Twilio notes that prices may change without notice and that additional carrier fees may apply, so check both before you budget.

Now do the math on a booked-call sequence. One single-segment text costs $0.0083 plus at most $0.005 in carrier fees on that table: about 1.3 cents. Six texts per lead, a generous sequence, comes to roughly 8 cents. A thousand leads: about $80 in message fees, plus inbound replies, which are billed too. Next to what you paid for those leads, that is rounding error. The expensive part of SMS is doing it wrong: a blocked campaign, a burned number or a lawsuit.

Write to the segment. A single emoji or curly quote switches a text to an encoding that fits far fewer characters, so one message can quietly become two or three billed segments. Plain characters, straight quotes, no emoji in operational texts.

Ready-to-use SMS scripts for booked-call funnels

Swap in your names, times and links. Character counts include the sample names shown and use plain characters only, so each fits in one 160-character segment; leave headroom for longer names. Use a link domain you own: CTIA expects shortened links to come from a shortener dedicated to the sender, not a shared public one. Put "Reply STOP to opt out" in the first text of every sequence and in every marketing text.

Before the call

Speed to lead. Within a minute of the opt-in. 139 characters.

Hi Sam, it's Jordan at Acme Advisory. Got your application. Pick a time for your strategy call here: example.com/call Reply STOP to opt out

Applied, not booked. Two hours after an unbooked application. 147 characters.

Sam, your application is in but no call is booked yet. Want me to hold a spot this week? Reply YES and I'll text you 2 times. Reply STOP to opt out

Booking confirmation. The moment the call is booked. 139 characters.

You're booked, Sam: Tuesday 2:00 PM ET with Jordan at Acme Advisory. Join: example.com/zoom Need a new time? Reply R. Reply STOP to opt out

Protecting the show

24-hour reminder. 144 characters.

Sam, your call with Jordan is tomorrow at 2:00 PM ET. Bring your current monthly revenue and your #1 goal. Can't make it? Reply R to reschedule.

1-hour reminder. 115 characters.

Sam, we start in 1 hour (2:00 PM ET). Join here: example.com/zoom Running late? Reply here so Jordan knows to wait.

After a miss or a maybe

No-show. Ten minutes after the start time. 130 characters.

Hi Sam, Jordan here. We missed you at 2:00. All good? Pick a new time here: example.com/call or just reply with a time that works.

Reschedule confirmed. 89 characters.

Done, Sam. Your call with Jordan is now Thursday 11:00 AM ET. Same link: example.com/zoom

Post-call maybe. Same day, from the closer. Marketing consent required. 128 characters.

Sam, thanks for today. Here's the case study I mentioned: example.com/proof Questions before Friday? Just reply. STOP to opt out

Reactivation

Old lead, quiet for 90 days or more. Marketing consent required. 144 characters.

Hi Sam, Jordan at Acme Advisory. Still planning to grow your business this year? Reply YES and I'll send you 2 call times. Reply STOP to opt out

Every reply should stop the automation and reach a human. A sequence that keeps firing after someone wrote back reads like a robot, because it is one.

SMS marketing best practices for high-ticket offers

1. Consent first, with receipts. SMS consent separate from email, covering marketing if you will send any, stored with the record.
2. Register before launch. No ads that depend on texts until 10DLC is approved.
3. Send as a person. First name and business name in the first text, never "Notification:".
4. One text, one job. One question or one link. Never an offer stapled to a reminder.
5. Stop on reply. Any inbound text pauses the sequence and alerts a human. Replies are the point of SMS.
6. Respect the clock. Reminders follow the appointment; marketing stays inside 8 a.m. to 8 p.m. recipient time.
7. Sync opt-outs. An opt-out in one tool suppresses the number in every tool that texts.
8. No bought lists. CTIA says senders should not use rented, sold or shared opt-in lists.

Which SMS metrics actually matter?

Read show rate by the week calls were booked, not the week they happened, or a slow booking week will look like a reminder problem. And watch delivery errors in your platform's logs: carrier filtering shows up there long before it shows up in revenue.

SMS tools: GoHighLevel LC Phone and the alternatives

For booked-call funnels the tool test is simple: texts must fire from the system that knows the appointment status. Otherwise you text "see you tomorrow" to someone who cancelled.

We default to GoHighLevel for booked-call funnels: calendar, pipeline, email and SMS share one contact record. If you are comparing stacks, our guide to marketing automation software covers the trade-offs, and our GoHighLevel pricing breakdown covers what it costs beyond the texts.

Order of operations matters. SMS protects calls; it does not create them. Dillon Kivo, founder of PersonalBranding.com, sells a high-ticket offer through a book-a-call funnel fed by Meta ads. After we built the funnel and ran the ads, booked calls went from 44 to 94 in 30 days while unique visitors rose only 10%, and landing page conversion went from 5.3% to 10.3% (see the case study). Those are page and booking numbers, not texting numbers. If your page leaks, start with funnel optimization, then let texts protect every call it books.

Calls getting booked but not showing? Get your GoHighLevel SMS and reminder system built right: consent capture, 10DLC registration, reminder and no-show flows, and show-rate tracking in one build.