When an SMS is sent, two separate actions happen:

1. The message gets sent

2. We receive a confirmation about its delivery status, which gets transferred to you

Sometimes, this confirmation can be delayed, even though your message may already have been delivered. Telecom networks purposely delay or skip the second step when congested to ensure resources are used to process messages. Rest assured, Bird will forward any delivery notification as soon as we receive it.

You can check for any ongoing issues at https://status.bird.com/. If no issues are reported, you can expect most delivery status updates within 72 hours of sending. 

If you terminate SMS via our SMS API, please ensure you pass the ‘reference’ parameter in your API request. It is required to receive a deliver report callback at your endpoint.