title: Is it possible to validate IMEI Number?
body: <p>For a mobile shop application, I need to validate an <a href="http://en.wikipedia.org/wiki/International_Mobile_Station_Equipment_Identity" rel="noreferrer">IMEI number</a>. I know how to validate based on input length, but is their any other mechanism for validating the input number? Is there any built-in function that can achieve this? </p>
  
  <p>Logic from any language is accepted, and appreciated.</p>