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Twilio Error 21410

The 'From' phone number is not a valid toll-free number.

Understanding Twilio SMS Communication API

Twilio is a cloud communications platform that enables developers to programmatically send and receive SMS messages, make and receive phone calls, and perform other communication functions using its web service APIs. Twilio's SMS API is widely used for sending notifications, alerts, and messages to users globally.

Identifying the Symptom: Error 21410

When using Twilio's SMS API, you might encounter the error code 21410. This error typically manifests when attempting to send an SMS message, and the operation fails with a message indicating an issue with the 'From' phone number.

What You Observe

Upon attempting to send an SMS, you receive an error response from Twilio's API that includes the error code 21410. This indicates that the 'From' number used in your request is not valid for the operation you are attempting.

Explaining Error 21410

Error 21410 is specific to the 'From' phone number used in your API request. Twilio requires that the 'From' number be a valid and verified number within your Twilio account. Specifically, for toll-free numbers, the number must be a valid Twilio toll-free number.

Root Cause of the Error

The primary cause of this error is using a 'From' number that is not recognized as a valid toll-free number by Twilio. This could happen if the number is not registered with Twilio or if it is not a toll-free number.

Steps to Resolve Error 21410

To resolve this issue, follow these steps to ensure that your 'From' number is valid and correctly configured:

Step 1: Verify Your Twilio Number

Ensure that the 'From' number you are using is a valid Twilio number. You can verify this by logging into your Twilio Console and checking your list of active numbers. Make sure the number is listed and marked as a toll-free number.

Step 2: Update Your API Request

Modify your API request to use a valid Twilio toll-free number. Here is an example of how your request should look:

{
"From": "+18001234567", // Replace with your valid toll-free number
"To": "+1234567890",
"Body": "Hello, this is a test message."
}

Step 3: Test Your Configuration

After updating your request, test sending an SMS again to ensure that the error is resolved. If the issue persists, double-check the number's status in your Twilio account.

Additional Resources

For more information on managing your Twilio numbers, visit the Twilio Phone Numbers Documentation. If you continue to experience issues, consider reaching out to Twilio Support for further assistance.

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