SMS Term
Opt-In
Customer consent to receive marketing text messages from your business. Required by law (TCPA) before sending any promotional SMS. Can be collected via web forms, keywords, or paper sign-ups.
Related Terms
TCPA (Telephone Consumer Protection Act)
U.S. federal law regulating telemarketing calls and text messages. Requires prior express written consent for marketing SMS, honoring opt-outs, and identifying your business. Violations can cost $500-$1,500 per message.
A2P (Application-to-Person)
Automated text messages sent from a software application to a customer's phone. This includes marketing campaigns, appointment reminders, and transactional alerts. A2P messaging requires carrier registration for compliance.
Deliverability
The ability of your SMS messages to successfully reach customer phones without being blocked by carrier filters. Affected by compliance status, message content, sending patterns, and sender reputation.