This application turns your phone into a full remote surveillance tool – however, you are not the active spy, but the phone will alert you whenever something interesting is happening.

The basic setup is simple. Set the “agent” – that’s the contact’s telephone number that should be informed in the case of an emergency. Next, place the phone at the place that you want to monitor, for example next to a baby.

From now on, the application will constantly monitor the audio level of its surroundings. If they exceed a pre-defined threshold, the phone will automatically call the agent. As a normal voice call is made, you can now hear the surroundings of the phone in order to judge if something serious is happening.

http://www.symbianresources.com/projects/spyphone.php