+63-77-(7264000...7269999): San Ildefonso, Ilocos Sur (ILS) Read more about +63-77-(7264000...7269999)
+63-77-(7270000...7279999): San Juan (Lapog), Ilocos Sur (ILS) Read more about +63-77-(7270000...7279999)
+63-77-(7350000...7359999): Santo Domingo, Ilocos Sur (ILS) Read more about +63-77-(7350000...7359999)