If your carrier supports them, you can enable them on Pulse SMS by going to Settings> Delivery Reports. Most carriers do not support this.
These are the possible statuses as messages are being sent:
- Sending - When the message displays the "Sending..." text below it.
- Sent - Android has received a response from your carrier, saying that they have received the message and will send it to your contact. The "Sending..." text will go away at this point.
- Delivered - If your carrier supports it, a double checkmark will be shown next to the message when your carrier reports that it has been delivered.
- Failed - Android or your carrier has reported that it couldn't accept the message and will not be able to send it to your contact. These messages turn red.