Notice: Canadian carriers don't differentiate SMS coming from toll-free phone numbers. For more information, see Information and best practices for using Toll-Free SMS in the US and Canada. While toll-free numbers specifically don't allow marketing or promotional messaging, they can offer reduced filtering on many kinds of transactional A2P messaging use cases. For more information, see What is a Messaging Short Code.įor A2P messaging to destinations in the U.S., toll-free phone numbers are designated for business messaging. and Canada, using a short code number allows you to get your messaging use case approved in advance, and avoid carrier filtering. What should I do if I suspect my messages are being filtered?įor A2P messaging in the U.S.
We flag these responses with Error 30007. In most cases, Twilio will receive an error back from the carrier when a message is filtered. This is commonly referred to as carrier filtering. If your messages are application-to-person (A2P) traffic, and are being sent using standard 10-digit long code phone numbers to users in the US or Canada, these messages may be blocked by carriers to enforce rules and regulations. Messages sent using 10-digit local long code phone numbers to the United States and Canada Please continue reading for more information and troubleshooting steps. False positives to multiple users, can be caused by carrier filtering, issues with local telecom infrastructure, or technical limitations.False positives to a single mobile device are likely caused by a device-specific issue.The false positive delivery status may occasionally occur at this point due to the following issues: This transition is explained in What are the Possible SMS and MMS Message Statuses, and What do They Mean. When we receive a notification from the carrier that the message has been sent to the destination, we change the status to Delivered.
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When Twilio sends a message, we update the message status to show Sent.
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This guide explains some of the possible causes of these false positive statuses, and how to troubleshoot them. However, there are cases when users may see a message status of Delivered, even when the message did not successfully reach the destination mobile device. Twilio strives to provide the most reliable delivery statuses possible for all messaging worldwide.
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