Android 使用 mcc 判断是否国内可以吗

Question

TelephonyManager tel = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
String networkOperator = tel.getNetworkOperator();

if (!TextUtils.isEmpty(networkOperator)) {
    Logger.d("getNetworkCountryIso :" + tel.getNetworkCountryIso());
    int mcc = Integer.parseInt(networkOperator.substring(0, 3));
    Logger.d("onCreate: mcc " + mcc);
}