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"First of all, I wanna make a special iphone application that enables listing near (about in 30 feet) people who installed the application although they minimized to the background of iphone.
For that purpose, I wonder whether it would works good using ""GPS"" but I think it would not experiencing ""whoshere"" things.
So I came to think of using ""Bluetooth"" but the most important thing is whether [ identifying just id or username of near devices(iphone) which the owners minimized the application ] is possible or not although the devices cannot send any data each other. "
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