title: php- How to detect MSISDN from headers?
body: <p>I am using getallheaders() function in php to check the users' headers.</p>
  
  <p>I want to detect their MSISDN (phone number) when they are on mobile data, and I've found 'x-msisdn' header for the same. So here's my problem, if a person is using UC Browser (HandlerUI version) then I am getting  "x-msisdn" header but not on any other browsers like stock, Opera, UC browser (original version) etc.</p>
  
  <p>How come UC browser handlerUI sets the "x-msisdn" header with every mobile operator but other browsers don't?</p>