Spy Phone - Secretly listen in on conversations remotely
http://www.aglaya.com/callmagic/index.asp

Call Cheat - Secretly pretend you are somewhere that you aren't
http://www.symbianware.com/product.php?id=callcheater60&pl=sx1

XCaller - Secretly pretend you have received a call to escape a situation
http://mobystar.com/Advert/Covert.htm

Call Recorder - Secretly record an incoming call
http://www.symbianware.com/product.php?id=callrecorder60&pl=n6600

Spy - Secretly spy on people
http://www.iolansoftware.fi/spy.html

SmartCrypto - Save secret photos as encrypted files
http://www.symbianware.com/product.php?id=scrypto60&pl=n6600

Call Magic - Secretly listen to people talking without them knowing
http://www.aglaya.com/callmagic/

MobileVDR-C - Secret surveillance from remote locations to your Nokia
http://www.alnetsystems.com/

Lie Detector - Detect if someone is telling the truth
http://www.agilemobile.com/downloads.html