SMS Messages Not Sending - How to Fix A2P Registration Issues
Troubleshoot SMS messages not sending from your AI receptionist. Verify A2P registration status and resolve common carrier blocks.
Quick Answer: If SMS isn't sending, the most common cause is incomplete A2P registration. Go to Connect > SMS Setup and check your registration status. SMS requires approved A2P verification to work with mobile carriers.
What You'll Learn
This guide explains why SMS messages might not be sending and how to resolve A2P registration issues.
Step-by-Step Troubleshooting
- Navigate to Connect > SMS Setup
- Check the A2P Registration status badge
- If 'Not Started' - Begin registration (required for SMS)
- If 'Pending' - Wait for approval (1-7 business days)
- If 'Denied' - Review the failure reason and resubmit
- If 'Registered' - Check other settings below
Common Causes
- A2P not started: Registration must be completed before sending SMS
- A2P pending: Registration is under review - wait for approval
- A2P denied: Registration was rejected - fix issues and resubmit
- Phone number not assigned: Need a phone number before SMS works
- Carrier filtering: Some messages flagged as spam by carriers
Why A2P Registration Is Required
A2P (Application-to-Person) registration is required by mobile carriers for businesses sending automated text messages. This helps:
- Verify your business is legitimate
- Protect consumers from spam
- Ensure high delivery rates for your messages
- Comply with carrier and FCC regulations
If A2P Is Approved But SMS Still Fails
- Verify the recipient phone number is correct (valid format)
- Check that the phone number can receive SMS (some landlines can't)
- Review message content for potential spam triggers
- Try sending to a different phone number to test
- Contact support if issues persist
Frequently Asked Questions
Q: How long does A2P registration take?
A: Typically 1-7 business days, depending on carrier review queues.
Q: Can I send SMS while A2P is pending?
A: No, SMS is blocked until A2P is approved to protect delivery rates.
Q: Why was my A2P registration denied?
A: Common reasons include EIN not found, business name mismatch, or sample message issues. Check the denial reason for specifics.
Related Articles
Bizzy Can Do This For You
Instead of doing this manually, just tell Bizzy:
"Help me fix SMS sending issues"Or navigate to: Connect > SMS Setup
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Last updated: February 1, 2025