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Error 20003 occurs when a request cannot be authenticated because the connected account credentials are invalid, expired, or no longer active. It can also appear when the connected account has been suspended or deactivated.TABLE…
Error 21211 occurs when an outbound call or message is sent to a phone number that is invalid, incomplete, or incorrectly formatted. The destination number must use E.164 format, which includes a plus sign,…
Error 21408 occurs when you attempt to send an SMS or MMS to a country or region that is not enabled or supported for messaging. These regional controls help prevent messages from being sent…
SMS messages can only be sent from a phone number or supported sender that is active, available in your account, and capable of sending SMS. If the selected sender is unavailable, incorrectly formatted, still…
Error 21610 occurs when you try to send a message to a recipient who has opted out of receiving messages or has Do Not Disturb settings enabled. Messaging remains blocked until the recipient properly…
Error 21614 occurs when you attempt to send an SMS to a destination number that is not recognized as a valid mobile number. In many cases, the number is a landline, is formatted incorrectly,…
Error 21635 occurs when you attempt to send an SMS message to a phone number that is identified as a landline. Standard SMS delivery requires a mobile-capable destination number.What Is Error 21635?Error 21635 means…
Error 30002 occurs when a message was queued successfully, but the account was suspended before the message could be sent. The message is not delivered until the underlying account issue is resolved.TABLE OF CONTENTSWhat…
Error 30003 occurs when an SMS cannot be delivered because the destination device is powered off, unreachable, unable to receive SMS, or temporarily unavailable through the recipient’s mobile carrier.TABLE OF CONTENTSWhat Is Error 30003?Key…
Error 30004 occurs when a message cannot be delivered because the destination number is blocked, unavailable, unable to receive SMS, restricted by local regulations, or has previously opted out of messaging.TABLE OF CONTENTSWhat Is…
Error 30005 occurs when an SMS cannot be delivered because the destination number is unknown, inactive, unreachable, or otherwise unable to receive messages. In some cases, the issue may also be related to the…
Error 30006 occurs when an SMS cannot be delivered because the destination number is unable to receive the message. This most commonly happens when the number is a landline or when the destination carrier…
Error 30008 occurs when a message fails to reach the recipient, but the carrier does not provide a specific reason for the failure. Because the returned carrier response is generic, additional troubleshooting is required…
Error 30011 occurs when an MMS cannot be delivered or received because MMS is not supported for the destination number, device, or region. The exact cause depends on whether the message was inbound or…
Error 30023 occurs when the daily messaging limit for your registered Brand has been reached. Once this limit is reached, additional messages to certain carrier networks may fail until the daily limit resets or…
Error 30032 occurs when a message is sent from a toll-free number to a recipient in the United States or Canada, but the sending number has not completed the required toll-free verification process.TABLE OF…
Error 30033 occurs when a message is sent from a U.S. A2P 10DLC campaign that has been suspended. While the campaign remains suspended, messages associated with that campaign cannot be delivered.TABLE OF CONTENTSWhat Is…
Error 30035 occurs when you try to send SMS from a newly registered U.S. A2P 10DLC number before carrier-level provisioning has fully completed. Even if the Brand and campaign are approved, the number may…
Error 30037 occurs when outbound messaging has been disabled for the account. Messages cannot be sent until the sending restriction is removed.TABLE OF CONTENTSWhat Is Error 30037?Key Benefits of Identifying an Account-Level RestrictionCommon Cause…
A temporary SMS restriction can occur when carrier fraud-prevention systems identify unusual or potentially suspicious traffic to a destination number. These restrictions are designed to protect recipients and messaging networks from abuse, but legitimate…
