SMS Automation Compliance: Texting Customers Without Legal Risk

Text messaging automation, such as appointment reminders, missed call text-back, lead follow-up and promotional campaigns, can be highly effective because texts are read quickly. It is also one of the most regulated forms of business communication. Rules on consent, opt-outs, timing and sender registration vary by country and, in the US, by state. Getting SMS compliance wrong can lead to blocked messages, carrier penalties and, in some cases, significant legal liability.

This article is general information, not legal advice. Consult a qualified adviser about your specific situation.

United States

TCPA

The Telephone Consumer Protection Act regulates calls and texts to mobile phones. Marketing texts sent using automated systems generally require prior express written consent from the recipient. Informational texts, such as appointment reminders, generally require at least prior express consent. TCPA litigation is common and statutory damages per message can add up quickly, so consent records matter.

State laws

Several states, such as Florida and Oklahoma, have their own telemarketing laws with additional requirements, including restrictions on texting hours. Check rules for the states where your recipients are.

Carrier registration (10DLC)

US mobile carriers require businesses sending application-to-person texts from standard 10-digit numbers to register their brand and messaging campaigns through The Campaign Registry. Unregistered traffic may be filtered or blocked. Most SMS platforms handle registration as part of setup. Toll-free numbers have their own verification process.

CTIA guidelines

Industry guidelines from CTIA cover consent, opt-out handling, message content and prohibited content. Carriers enforce them.

Other markets

United Kingdom: PECR generally requires consent for marketing texts, with a limited “soft opt-in” for existing customers who were given a chance to opt out. UK GDPR applies to the personal data involved.

Canada: CASL requires express or implied consent for commercial electronic messages, including texts, with identification and unsubscribe requirements.

Australia: the Spam Act requires consent, sender identification and a functional unsubscribe facility for commercial messages.

Practical compliance steps

Get clear consent

Collect consent with explicit language at the point of signup, stating that the person agrees to receive texts, what kind and roughly how often, and that message and data rates may apply. Do not pre-tick consent boxes. Keep consent separate from agreeing to purchase where required.

Keep records

Store when, where and how consent was given, including the wording shown.

Identify yourself

Include your business name in messages.

Honour opt-outs immediately

Recognise STOP and similar keywords and stop messaging promptly. Most platforms handle standard keywords automatically; make sure your automations respect opt-out status across all workflows.

Respect timing

Avoid sending outside reasonable hours in the recipient’s time zone, and follow any state-specific quiet hours.

Separate transactional and marketing messages

Appointment reminders and promotions have different consent requirements. Do not slip promotional content into transactional messages without appropriate consent.

Avoid prohibited content

Carriers restrict certain content categories and may block messages with shortened links from public URL shorteners. Use branded links where possible.

Common automation risks

• Importing contact lists without documented consent and enrolling them in text campaigns.
• Workflows that ignore opt-out status.
• Missed call text-back sending marketing content to people who only called.
• Sending to numbers that have been reassigned to new owners.
• Unregistered sending numbers.

Build consent checks into every SMS workflow. See our guide on automation and data privacy.

Effective and compliant

SMS automation works best when recipients expect and value the messages. Clear consent, honest content and easy opt-outs keep messaging effective and protect the business. Related guides: missed call text-back and appointment reminders.

If you use or plan to use SMS automation, our AI automation service can set up workflows with consent capture, opt-out handling and registration in place.