title: Detect nearby mobile devices from an iOS app
body: <p>Is it possible to create an iOS app which will scan for nearby mobile devices (eg. iPhone, Android, iPad etc), without needing to run any custom app on those nearby mobile devices?</p>
  
  <p>I have tried using CoreBluetooth like so, running on my iPhone 6+:</p>
  
  <pre><code>[self.centralManager scanForPeripheralsWithServices:nil options:nil];
  </code></pre>
  
  <p>But the only nearby device it detects is my iMac, it will not detect my iPad Air 2, or my bluetooth earpiece.</p>
  
  <p>Am I doing something wrong?</p>