title: How could I use Bluetooth 2.1 programmatically? (with iPhone4)
body: <p><em>Environment:</em> iPhone4(Bluetooth 2.1) and Samsung Galaxy S3(Bluetooth 4.0). </p>
  
  <p><em>Needs:</em> I want to know that how to code <strong>advertising with Bluetooth 2.1</strong>. Could I use <code>CoreBluetooth</code>?</p>
  
  <p><em>Details:</em> (peripheral) iPhone4 advertises "some data" through Bluetooth 2.1, and (central) Galaxy S3 catches not only the basic information of iPhone4 but also the "some data" from iPhone4.</p>
  
  <p>I'm new in iOS programming. I'll be grateful for any answer.</p>
  
  <p>Thank you.</p>
  
  <p><em>Followings are added</em></p>
  
  <p><img src="https://i.imgur.com/Ls5GU7L.png" width="200"/></p>
  
  <blockquote>
    <p><em>Screenshot on Galaxy S3</em></p>
  </blockquote>
  
  <p>iOS doesn't need to search anything. I've already seen that iPhone4 cannot search any android devices. I just want to know about peripheral iOS and central android. The fact is Galaxy S3 could find iPhone4, so I wondered it might be possible for Galaxy S3 to get a little more data packet with the device's name while searching devices via bluetooth. And if yes, I want to know how to code that in iOS side.</p>