We have seen Mobile Tracker and many related to apps to identify our misplaced phones. Here is an app that shows the location of it when you shout. Marco Polo application helps you to find your lost smartphone by allowing your device to respond when you shout and also gives clues to its location.

A users can find their hidden device by shouting “Marco!” loudly. It will respond “Polo.”  This application is created by Matt Wiechec, a designer and developer based in Toronto.

Making the app more workable it doesn't need any cellular or Wi-Fi connection in order to function. The app is made available in the Apple iTunes store for $ 0.99 and is a 23 MB download.

(AW: Vamshi)