Checklist
SMS List Validation Checklist
Texting landlines and dead numbers wastes spend and risks carrier penalties. Validate before every SMS campaign.
Validate the numbers
- Confirm each number is a valid, correctly formatted (E.164) number.
- Check line type and drop landlines and VoIP where not allowed.
- Confirm active status — remove disconnected numbers.
- Standardize country codes for international lists.
Stay compliant
- Confirm you have opt-in consent for SMS for each contact.
- Include clear opt-out (STOP) handling.
- Respect quiet hours and local regulations.
- Keep records of consent.
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