Area Code +63-78-(3530000...3539999) located in Cauayan City, Isabela (ISA), more detail is as below. Place International Dialing Code : 63 International Prefix : 00 National Prefix : 0 National Destination Code : 78 Subscriber Number From : 3530000 Subscriber Number To : 3539999 National Destination Code Length : 2 Uses National Destination Code : Yes National Significant Number Length : 9 Number Type : G (Geographic Land Line, Fixed Line) Carrier Name : Philippine Long Distance Telephone Company (PLDT) Click here to buy Philippines Area Code Database Other Information Language Code : en (English) Country Number : 608 (Philippines) Country Code : PH (Philippines) Region Code : ISA Region Name : Isabela City : Cauayan City Timezone : Asia/Manila Coordinated Universal Time : +08:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 9 Latitude : 16.9300 Longitude : 121.7700 ‹ previous : +63-78-(3520000...3529999) next › : +63-78-(3550000...3559999) Dialling Instructions For trunk calls: 0 78 3530000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 63 78 3530000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 3530000 ~ 3539999 (Count: 10,000) Example: +63-78-3530000 / 0063-78-3530000 (078-3530000 / 0-78-3530000) +63-78-3530001 / 0063-78-3530001 (078-3530001 / 0-78-3530001) +63-78-3530002 / 0063-78-3530002 (078-3530002 / 0-78-3530002) +63-78-3530003 / 0063-78-3530003 (078-3530003 / 0-78-3530003) +63-78-3530004 / 0063-78-3530004 (078-3530004 / 0-78-3530004) ...+63-78-xxxxxxx / 0063-78-xxxxxxx (078-xxxxxxx / 0-78-xxxxxxx) ...+63-78-3539995 / 0063-78-3539995 (078-3539995 / 0-78-3539995) +63-78-3539996 / 0063-78-3539996 (078-3539996 / 0-78-3539996) +63-78-3539997 / 0063-78-3539997 (078-3539997 / 0-78-3539997) +63-78-3539998 / 0063-78-3539998 (078-3539998 / 0-78-3539998) +63-78-3539999 / 0063-78-3539999 (078-3539999 / 0-78-3539999)