title: ios IDFV store in Keychain
body: <p>i need <strong>Device ID</strong> which never change, i try <strong>UDID</strong> but is not available in <strong>IOS 6/7/8</strong> so , i try With <strong>IDFV</strong>
  I've store <strong>IDFV</strong> in keychain which same after uninstalling app</p>
  
  <pre><code>   NSString *idfv = [[[UIDevice currentDevice] identifierForVendor] UUIDString];
  </code></pre>
  
  <p>stored that <code>idfv</code> to the Keychain using <code>SSKeyChain</code></p>
  
  <p>When I "Reset content and settings" all stored data in keychain is deleted, and create new <strong>IDFV</strong>. I am new in IOS So I don't know how and where store my string which save my ID permanently. </p>