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Twilio Error 21415

The 'To' phone number is not a valid local number.

Understanding Twilio and Its Purpose

Twilio is a cloud communications platform that enables developers to build, scale, and operate real-time communications within their software applications. It provides APIs for SMS, voice, video, and other communication channels, allowing seamless integration into applications. Twilio's SMS API is widely used for sending and receiving text messages globally.

Identifying the Symptom: Error 21415

When using Twilio's SMS API, you might encounter an error message labeled as Error 21415. This error indicates that the 'To' phone number provided in your API request is not a valid local number. As a result, the SMS cannot be delivered to the intended recipient.

Exploring the Issue: What is Error 21415?

Error 21415 is a common issue faced by developers using Twilio's SMS API. It occurs when the phone number format does not comply with the expected local or international standards. This can happen due to incorrect formatting, missing country codes, or invalid number lengths.

Common Causes of Error 21415

  • Incorrect phone number format.
  • Missing or incorrect country code.
  • Invalid number length.

Steps to Fix Error 21415

To resolve Error 21415, follow these actionable steps:

Step 1: Verify the Phone Number Format

Ensure that the phone number is formatted correctly. Use the E.164 format, which includes the country code followed by the national number. For example, a US number should be formatted as +12345678900.

Step 2: Check the Country Code

Make sure the phone number includes the correct country code. You can refer to Twilio's E.164 documentation for more information on international phone number formatting.

Step 3: Validate the Number Length

Verify that the phone number length is appropriate for the country. Different countries have different standard lengths for phone numbers. You can use Twilio's Lookup API to validate the phone number.

Additional Resources

For further assistance, consider exploring the following resources:

By following these steps, you can effectively resolve Error 21415 and ensure successful SMS delivery using Twilio's API.

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