While I like this idea, I think it's a touch redundant. There are at least 4 ways to skin this cat, and this looks like the hardest one. That said, it looks like you're 90% done with it already, so... Yay for existing community tools! And really, who doesn't want another way to skin a cat? The most trivial way is to go into off-line mode. Your carrier will forward all things to your voicemail. Another way would be to use existing tools (cron or QBW, and forwarder) to make it so at set times or when activated it just forwards all calls directly to your existing voicemail. You should get a log that someone called, but the phone would not ring. Alternatively, you could use an on-line service to do this for you, like Google Voice. Give out your voice number, and have it forward to your cell. Voice can be set to give custom messages during set times. There are also extensions and apps to allow for dial-through and do direct SMSing through GV to preserve that origin number for outbound traffic. While I love the concept of what you're doing, it feels like killing a fly with a shotgun. Fun if you like shotguns, I suppose... but probably not the most efficient way. As for what you're actually doing: I think the hard part will be manipulating the mic/input side of things while the default Nokia phone app is running so people don't hear a second of whatever's going on on your side. A second may not seem like much, but just image if that ring picked up just in time to hear: "<ring> OH! Yes! Bab... <click> I can't come to phone right now. Please leave...."