What should I do if I receive Twilio error code 21610?

Error 21610 means the recipient opted out by replying STOP. They must reply START to opt back in before you can message them again.

What does error code 30008 represent?

Error 30008 is a generic delivery failure where the carrier did not provide a specific reason. Use the error code as a starting point and review number type, handset status, and recent sending/content changes.

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Twilio Error Messages – BizStackPro Help

Twilio Error Messages

Q: How can I address error code 30003?

Error 30003 indicates a temporary unreachable handset (phone off, out of coverage, or in airplane mode). Try again later.

Q: Why was my message filtered (error 30007)?

Error 30007 typically means the carrier filtered the message as potential spam or phishing. Review your content, avoid spam-like formatting, and follow Twilio messaging guidance.

Learn what Twilio error codes mean, where to find them in BizStackPro, and how to troubleshoot common SMS and call delivery issues.

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Overview

Twilio powers calling and SMS inside BizStackPro. When a call or message fails, Twilio typically returns a 5-digit error code (for example 30003 or 21610) to explain what happened. This guide shows you where to find those codes and how to use them to troubleshoot.

Quick tip: Capture the error code, the destination number, and the approximate time of the send attempt before troubleshooting. This makes investigations and support tickets much faster.

Part 1: What Are Twilio Error Messages?

Twilio error codes describe why a call or message did not complete. Carriers (Verizon, AT&T, T-Mobile, etc.) ultimately decide whether a message is delivered, filtered, or rejected, and Twilio reports the carrier response using these codes.

Twilio maintains a full library of error codes and explanations:

https://www.twilio.com/docs/api/errors

Part 2: Where to Find Twilio Error Codes in BizStackPro

1) Inside a Contact Record

Open the contact’s communication history. Failed calls or SMS often display a red triangle icon. Click the icon to view the associated error code (for example 30008).

2) Workflow Execution Logs

Go to Automation → Workflows → Execution Logs. Select the execution and click View Details to see message results and any returned error codes.

Part 3: Common Twilio Errors

Below are several frequently encountered Twilio error codes and what they commonly mean.

Error 21610: The recipient opted out by replying STOP. They must reply START to opt back in.
Error 30003: Temporary unreachable handset (phone off, out of coverage, or in airplane mode).
Error 30005: Unknown destination handset (may be a landline, invalid number, or unavailable).
Error 30006: Destination is unreachable, often because the number is a landline.
Error 30007: Message filtered as spam or phishing by the carrier. Review your content and adjust message structure and wording.
Error 30008: Generic error with no detailed explanation from the carrier.

Note: The same error can have different root causes depending on carrier behavior, region, and message content. Use the code as your starting point, then confirm what changed (number, content, sending volume, workflow logic, etc.).

Reduce failed sends with better visibility

If you know where to find the code, you can diagnose issues faster—especially opt-outs, unreachable devices, and carrier filtering.

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Frequently Asked Questions

What should I do if I receive error code 21610?

The recipient has opted out. They must reply START to receive messages again.

How can I address error code 30003?

This indicates a temporary issue (phone off/out of range). Try again later.

Why was my message filtered (error 30007)?

Carriers may block messages that appear to be spam. Review your message content, avoid spam-like formatting, and ensure your messaging is compliant.

What does error code 30008 mean?

A generic delivery failure with no detailed reason from the carrier. Review the send context and check Twilio’s error library for likely causes.

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Power your phone + SMS inside BizStackPro

Connect Twilio for calling, texting, and automation—and troubleshoot faster by using error codes to pinpoint carrier and handset issues.

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SMS, calling, and automation.

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