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A2P SMS Compliance Checklist

Keep this checklist handy to ensure every SMS campaign follows current US carrier guidelines and avoids blacklisting.

✅ Before Sending Any Campaign
  • Confirm all contacts explicitly opted in to receive SMS
  • Validate phone numbers (remove landlines and VOIP numbers)
  • Register for A2P 10DLC (U.S. business messaging compliance)
  • Use a registered brand and campaign ID
  • Set up keyword-based opt-out handling (e.g., STOP, UNSUBSCRIBE)
  • Enable automated number validation (if available)
📤 Message Content Must Include:
  • Clear sender identity (brand, business, or agent name)
  • Reasonable message frequency (e.g., no spamming in short bursts)
  • Opt-out instruction: “Reply STOP to unsubscribe”
  • Avoid disallowed terms (e.g., “free money,” “click here now,” medical claims without context)
📊 After Sending:
  • Monitor opt-out rate ( 5% is risky)
  • Monitor error rate ( 10% may trigger blocks)
  • Check for carrier filtering or sudden drops in delivery
  • Log any user complaints or manual unsubscribes
🚫 What Not To Do:
  • Don’t send bulk SMS to cold leads or purchased lists
  • Don’t use SMS for high-pressure marketing without clear opt-in
  • Don’t send identical messages in rapid succession to large groups
🛡️ Tools That Help (Check with Your Provider)
  • Carrier filtering alerts (like HighLevel’s real-time warnings)
  • SMS compliance templates & automation
  • Built-in suppression lists / block keyword matching
  • Local number validation before send
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