The inReach will check for new messages according to the message check interval you have set for your device. If you are expecting an important reply and want to check your incoming messages sooner, you can perform an on-demand mailbox check from the Earthmate app by performing the following steps:
1. Open the Earthmate app .
2. Tap on More.
3. Tap on My inReach.
4. Tap on Check for New Messages.
Note: The inReach device must be outside and have a clear view of the sky in order to retrieve messages.
If you need to adjust the message check interval, please read this article: http://support.inreachcanada.com/kb/articles/149