+63-77-(6000000...6009999): Laoag City, Ilocos Norte (ILN) Baca lebih lanjut mengenai +63-77-(6000000...6009999)
+63-77-(6020000...6029999): San Nicolas, Ilocos Norte (ILN) Baca lebih lanjut mengenai +63-77-(6020000...6029999)
+63-77-(6040000...6049999): Candon City, Ilocos Sur (ILS) Baca lebih lanjut mengenai +63-77-(6040000...6049999)
+63-77-(6050000...6059999): Vigan City, Ilocos Sur (ILS) Baca lebih lanjut mengenai +63-77-(6050000...6059999)
+63-77-(6064000...6064999): Laoag City, Ilocos Norte (ILN) Baca lebih lanjut mengenai +63-77-(6064000...6064999)
+63-77-(6068000...6068999): Laoag City, Ilocos Norte (ILN) Baca lebih lanjut mengenai +63-77-(6068000...6068999)
+63-77-(6069000...6069999): Laoag City, Ilocos Norte (ILN) Baca lebih lanjut mengenai +63-77-(6069000...6069999)
+63-77-(6070000...6079999): Laoag City, Ilocos Norte (ILN) Baca lebih lanjut mengenai +63-77-(6070000...6079999)
+63-77-(6080000...6089999): Laoag City, Ilocos Norte (ILN) Baca lebih lanjut mengenai +63-77-(6080000...6089999)
+63-77-(6100000...6109999): San Nicolas, Ilocos Norte (ILN) Baca lebih lanjut mengenai +63-77-(6100000...6109999)
