title: How can we detect android BLE advertisement capable phones
body: <p>I am now working with BLE technology. Since I have to test with android BLE I have to purchase some android phones that capable of BLE advertisement. </p>
  
  <p>I thought all the phones with BLE version 4.1+ supports BLE advertisement. So I bought a phone but that was a big mistake (it only supports central mode).</p>
  
  <p><strong>How can I detect which phones are capable of advertisement using the bluetooth specification?</strong></p>
  
  <p><strong>What do following terms mean: A2DP, LE, aptX?</strong></p>