The TelephonyManager has a method to return the MCC+MNC as a String (getNetworkOperator()) which will do you what you want. You can get access it via:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TelephonyManager tel = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
String networkOperator = tel.getNetworkOperator();
if (!TextUtils.isEmpty(networkOperator)) {
int mcc = Integer.parseInt(networkOperator.substring(0, 3));
int mnc = Integer.parseInt(networkOperator.substring(3));
}
}