Android 判断SIM卡属于哪个移动运营商

 public String getProvidersName()
  {
    String str = "N/A";
    try
    {
      this.IMSI = this.telephonyManager.getSubscriberId();
      System.out.println(this.IMSI);
      if (this.IMSI.startsWith("46000"))
       str = "中国移动";  break;
      if (this.IMSI.startsWith("46002"))
       str = "中国移动"; break ;
      if (this.IMSI.startsWith("46001"))
        str = "中国联通";
      else if (this.IMSI.startsWith("46003"))
        str = "中国电信";
    }
    catch (Exception localException)
    {
      localException.printStackTrace();
    }
         return str;
  }