Phone is currently unreachable/unavailable

Hello,

I understand that you are facing SMS delivery issues with the error message “Phone is currently unreachable/unavailable”.

Please note that when an SMS is sent via SNS, the message is forwarded to the downstream aggregators , who forward it to the phone carrier. The phone carrier is then responsible for sending the messages to the destination phone/recipient. SNS service relies on mobile carriers for the last leg of the SMS delivery. So, issues/restrictions inside certain mobile carriers or with mobile device can sometimes affect the overall SMS delivery.

AWS (SNS) → Message leaves AWS Infrastructure →Downstream Provider → Phone Carriers → Mobile Endpoint

The delivery status of “Phone is currently unreachable/unavailable” usually indicates that the mobile device was either switched off or out of coverage area when the message was being delivered. However, as you have mentioned that all the message are being failed with this error reason, we would need further details from your side.

Hence, in order to further investigate this issue and find the root cause of the SMS failures, we would request you to reach out to AWS Premium Support via a Support Case and share the SNS delivery logs with us.

[+] Reach out to AWS Premium Support: https://aws.amazon.com/premiumsupport/

[+] Enabling SMS delivery logs: https://repost.aws/knowledge-center/monitor-sns-texts-cloudwatch

The delivery logs contain essential information like message id, origination number, destination number, reason for failure, etc which would help us in troubleshooting the issue from our side. Hence , we would request you to reach out to AWS Premium Support via a Support Case to investigate this issue further.