+63-77-(2560000...2569999): Santo Domingo, Ilocos Sur (ILS) Read more about +63-77-(2560000...2569999)
+63-77-(3000000...3009999): Laoag City, Ilocos Norte (ILN) Read more about +63-77-(3000000...3009999)
+63-77-(3010000...3019999): Batac City, Ilocos Norte (ILN) Read more about +63-77-(3010000...3019999)