When open, application should show a list of items. Each item consists of text: <Name> (<status>) <temperature>, e.g. Alex (active) 23.5C. For this prototype application, make it show just a single item, but make it look really cool. So design is important.
You should add to application an option to invoke popup message. The popup should say "I'm here, waiting to be found". While popup is open, iPhone should vibrate and ring.
That it. Please specify "iPhone" as first word in your bid so that I know you are not a robot. Look forward for your bids.