Ok, I think what you’re saying is you want to set up an OpenVPN server on your Omnia, and use your Android device as a client when you are away from your home (or wherever you have your Omnia set up), is that correct?
If you are trying to set up OpenVPN server on your Omnia and the client on your Android device and use your Android device while it’s on the Omnia Wifi, well yes, all your communication is just going to go through the Omnia, you’re already on the same network.
Anyway, if the first case is what you’re trying to do, you’ll need to configure the OpenVPN server on your Omnia. Set up a client configuration file on your Android device and connect. If you search with google you should find many guides and how-tos explaining the procedure, some of which may be specific to your Android device and OpenVPN application on that device (sorry, I have no idea what you’re using, so I can’t be of much help there). You may be able to use Android’s built-in VPN as well, again it depends on your software version and Android device.
If you want to check if you’re being routed through your VPN, the simplest way is to use a web site like whatismyipaddress.com or the like, see if it’s coming from your Omnia or your cellular provider (if you’re android is on a cell network).
Sorry, but you’re just not providing enough information for specific answers, so hopefully this will get you started.