Zello asynchronous messaging lets you send voice messages to users, even if network connection has been lost by either you or the other user. This can be useful for users who lose connection for a brief period of time, such as while driving under a tunnel or riding in an elevator.

Note: Asynchronous messages are only available for direct contact.

1. An arrow followed by a number shows the number of queued messages, which are received by the user when they are back online. Note: number is only available on Android. 

2. Open the history to see the status of the messages. The "up" arrow means Zello is sending the message.  

3. On Android, the arrow points diagonally when the user has received the message. On iOS, the arrow disappears.