I've never quite understood the connection. If you have a Google Voice phone number set to forward those calls to your cell phone, do you need to have the app running on your cell phone for this to work or can it be manually turned off? I would imagine that the call forwarding would work regardless, but what about the app keeping track of those calls in a call list, or keeping track of the voicemails, etc.? Can you just open the app manually and all of this information will be there, or does it need to be running at all times in order to record the phone calls/voicemail as they come in? Thanks.