Few marketing channels are as direct as a text message. It lands on the device people carry everywhere, it is short by design, and it does not have to compete with a crowded inbox or an algorithmic feed. For appointment reminders, flash sales, delivery updates and win-back offers, SMS can be remarkably effective.
That directness is also why SMS is the most tightly regulated mainstream marketing channel. Sending marketing texts without proper consent can lead to carrier blocking, platform bans and, in the US, legal claims. Done carelessly, SMS also annoys people faster than almost anything else.
This practical guide explains how SMS marketing works in 2026, the consent and compliance basics in the US and UK, the types of messages worth sending, a step-by-step launch plan, writing tips and the metrics that show whether it is working. It is general guidance, not legal advice, so confirm your setup with a qualified adviser.
Key Takeaways
- Get clear, documented consent before sending marketing texts, and honour opt-outs quickly.
- In the US, business texting over standard 10-digit numbers requires A2P 10DLC brand and campaign registration.
- Send fewer, more useful messages: reminders, time-sensitive offers and genuinely valuable updates.
- Keep messages short, identify your brand, and always include opt-out instructions.
- Track revenue or bookings per message and unsubscribe rates, not just clicks.
Why SMS Marketing Works
Reach is the obvious advantage. Pew Research Center's mobile fact sheet (published November 2025, based on a June 2025 survey) found that 98% of US adults own a cellphone and 91% own a smartphone. SMS works on every one of those phones without an app, an account or a social media algorithm deciding who sees the message.
SMS also suits moments that need immediate attention: a reminder an hour before an appointment, a delivery that is about to arrive or a sale ending tonight. It complements email rather than replacing it. Email is better for longer stories and detail; SMS is better for short, timely prompts. Messaging apps are a third option; see our guide to WhatsApp marketing.
Consent and Compliance Basics
United States
The Telephone Consumer Protection Act (TCPA) and the FCC's rules treat text messages much like calls. For marketing texts sent with automated systems, businesses generally need the recipient's prior express written consent, which is why compliant sign-up forms include clear disclosure language and an unchecked consent box. Key points from the FCC's current rules (47 CFR 64.1200):
- Revoking consent: people may revoke consent by any reasonable means. Replying with words such as "stop", "quit", "end", "revoke", "opt out", "cancel" or "unsubscribe" counts as a reasonable method.
- Timing: opt-out requests must be honoured within a reasonable time, not exceeding ten business days.
- Quiet hours: telephone solicitations may not be made before 8 a.m. or after 9 p.m. in the recipient's local time. Many states add stricter rules, so check where your subscribers live.
Carriers add their own requirements. Twilio explains that A2P 10DLC is the standard US carriers have put in place for application-to-person messages sent from ordinary 10-digit long codes, and anyone sending such messages to US numbers must register. Brand registration tells carriers who you are; campaign registration describes what you send and how people opt in, opt out and get help. Unregistered traffic is likely to be filtered or blocked.
United Kingdom
Under the Privacy and Electronic Communications Regulations (PECR), the Information Commissioner's Office is direct about the default rule:
“You must not send marketing emails or texts to individuals without specific consent.”
— Information Commissioner’s Office (ICO), Electronic mail marketing
There is a limited "soft opt-in" for existing customers: you may be able to text your own customers about similar products and services if you gave them a clear chance to opt out when you collected their details and in every message.
Compliance checklist
| Requirement | What to do |
|---|---|
| Clear consent | Use a separate, unticked opt-in that names your brand, the type of messages and expected frequency |
| Proof of consent | Store timestamp, source, wording shown and phone number for every opt-in |
| Double opt-in | Send a confirmation text and require a reply (strongly recommended) |
| Brand identification | Start messages with your business name |
| Opt-out instructions | Include "Reply STOP to opt out" or similar, and process all reasonable opt-out replies |
| Help keyword | Respond to HELP with contact details |
| Sending hours | Send only within permitted local hours; avoid early mornings and late evenings |
| Registration | Complete A2P 10DLC (or toll-free verification / short code approval) before sending in the US |
| Privacy policy | Explain how phone numbers are used and that they are not sold for marketing |
Types of SMS Messages Worth Sending
- Appointment and booking reminders: reduce no-shows for clinics, salons and service businesses.
- Order and delivery updates: transactional messages customers actively want.
- Abandoned cart nudges: a short follow-up to subscribers who opted in, alongside abandoned cart emails.
- Time-sensitive offers: flash sales, last-minute availability, early access for subscribers.
- Loyalty updates: points balances and rewards, which fit well with customer loyalty programs.
- Win-back messages: a personal offer to lapsed customers; see win-back campaigns.
- Review requests: a short thank-you after purchase or service with a direct review link, coordinated with your post-purchase emails.
How to Launch SMS Marketing Step by Step
- Define the job of SMS. Decide which two or three use cases matter most (for example, reminders and flash sales) and how SMS fits your multichannel marketing plan.
- Choose a platform. Look for consent capture, opt-out handling, quiet-hours controls, segmentation, automation, link tracking and integration with your store or CRM.
- Register your sender. Complete A2P 10DLC, toll-free verification or short code approval as appropriate for your market.
- Build compliant opt-in points. Checkout, account sign-up, a website pop-up or form, keyword text-to-join on signage, and in-store sign-up.
- Send a welcome message. Confirm the subscription, state frequency, include STOP/HELP instructions and deliver any promised incentive.
- Set up automated flows first. Welcome, reminder, cart, post-purchase and win-back flows deliver steady value with little manual effort. Our guide to marketing automation explains how to plan them.
- Plan campaigns sparingly. Start with a modest cadence and increase only if unsubscribe rates stay low.
- Track and refine. Tag links with UTM parameters and review results per message and per flow.
Writing Effective Text Messages
- Lead with your brand name so people know who is texting.
- Put the value in the first line: the offer, deadline or update.
- Keep it short. A standard SMS segment holds a limited number of characters, and emojis or special characters reduce that limit, so long messages may be split and cost more.
- Use one clear call to action and one link.
- Personalise with care: first name and relevant product or location details.
- Always include opt-out instructions.
Example (salon reminder):
Bella Hair: Hi Sam, see you tomorrow at 2:30pm with Priya.
Need to change? Reply C to reschedule. Reply STOP to opt out.Metrics to Track
| Metric | Why it matters |
|---|---|
| List growth and opt-in source | Shows which sign-up points work |
| Delivery rate | Low delivery can indicate filtering or registration problems |
| Click-through rate | Measures interest in the message |
| Conversion and revenue per message | The best measure of commercial value |
| Opt-out rate per send | Early warning of over-messaging or irrelevant content |
| Cost per message vs revenue | SMS is paid per message, so efficiency matters |
| No-show reduction (for reminders) | Direct operational value for service businesses |
Common SMS Marketing Mistakes
- Texting people who only gave their number for delivery or billing without marketing consent.
- Buying or importing lists of phone numbers. Never do this.
- Ignoring non-standard opt-outs such as "please stop texting me".
- Sending too often, which drives opt-outs and complaints.
- Sending at night or early morning, which annoys people and can break rules.
- Skipping sender registration, which leads to blocked messages.
- Using SMS as a copy of email rather than writing for the format.
Many of the principles that make email successful apply here too, so it is worth reviewing our email marketing best practices.
Related Guides
- Customer Loyalty Programs That Keep People Coming Back
- Product Launch Marketing: A Step-by-Step Plan
- Pricing Psychology: Tactics That Influence Buying Decisions
Frequently Asked Questions
Is SMS marketing legal?
Yes, when you follow the rules. In the US that generally means prior express written consent for automated marketing texts, honouring opt-outs and registering your sending numbers. In the UK, PECR requires specific consent unless the soft opt-in for existing customers applies.
What is A2P 10DLC?
It is the US carrier standard for business (application-to-person) messages sent from regular 10-digit phone numbers. Businesses must register their brand and campaigns before sending, or messages are likely to be filtered.
How often should I send marketing texts?
There is no universal number. Start with a low cadence, tell subscribers what to expect at sign-up, and watch opt-out rates. Automated, triggered messages are usually better received than frequent broadcasts.
How quickly must I process an SMS opt-out?
Immediately is best practice. Under current US FCC rules, revocation requests must be honoured within a reasonable time, not exceeding ten business days.
Is SMS better than email?
They do different jobs. SMS is ideal for short, time-sensitive messages; email is better for detail, storytelling and lower-cost frequent contact. Most businesses get the best results using both.
Conclusion
SMS marketing rewards respect. Collect clear consent, register properly, send messages people are glad to receive and make leaving easy. Start with automated reminders and transactional flows, then add carefully timed offers, and judge the channel on revenue and opt-out rates.
Want SMS and email working together as one retention system? Our email marketing service can plan your flows, segments and messaging. Get a quote to get started.
