I used to have Gsmart I350. There was a nice feature of that phone. Let me quote to give you some idea from their web page about their application. The method is named as fallows; Wise Talk. Quote: Wise Talk Ever felt tired of being chased everywhere because of mobile phone? Wise Talk is the 100% in-house built software which gives you the freedom of deciding when to pick up a call. The Overdub feature simulates background noises to your callers to camouflage your actual location. Try out the sound of airport or concert or meeting room. The Answering Machine can playback pre-recorded greetings. When there is an incoming call, You can even set different greetings for different callers. Nice, isn't it I couldn't find that type of application in the android market for the covering my actual location. May be there is. Could you give me an information if there is.