Note that the only version of Connected Warehouse that works with the iPhone is Connected Warehouse 15, which only works with Connected Business 15. All releases after 15 targeted the iPad only...
On the server, in the DBMC, you can check for updates and it will give you the latest build with the release notes for that build.
Every month or so, we roll all the updates into a new installer and post it in the blog - https://connectedbusiness.com/b-release-notes-for-connected-business-22-sp1.aspx
Odd question... do you have something one can query to check what the latest stable build? I do not have the auto-update option allowed and be nice to check on what the current version is quickly so to see and plan future upgrades.