title: Consultation about android phone number
body: <p>i try to get my phone number like this:</p>
  
  <pre><code>private String getMyPhoneNumber(){
          TelephonyManager mTelephonyMgr;
          mTelephonyMgr = (TelephonyManager)
              getSystemService(Context.TELEPHONY_SERVICE); 
          return mTelephonyMgr.getLine1Number();
  </code></pre>
  
  <p>but i get null</p>
  
  <p>how to fix it ? and how to get Provider Name</p>