title: how to get country phone prefix from iso
body: <p>I got the country iso by the code from this <a href="https://stackoverflow.com/questions/3659809/where-am-i-get-country">answer</a>:  </p>
  
  <pre><code>TelephonyManager tm = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
  String countryCode = tm.getSimCountryIso();   
  </code></pre>
  
  <p>how can I get the prefix phone number for country?<br>
  for example +972 for il.</p>