Area Code 635 – Gunung Tua
The phone area code for Gunung Tua is 635 (international format +62635). Browse local exchange codes (NXX) and carrier assignments below.
📍 Geographic Location of Gunung Tua
Geographic Overview
The +62 635 country calling code prefix is assigned to the Gunung Tua area in North Sumatra, Indonesia. Gunung Tua serves as the administrative center of the Padang Lawas Utara Regency, a region known for its cultural heritage and growing local economy. This geographic code is part of Indonesia's national numbering plan, which follows ITU-T E.164 recommendations. The prefix 635 is a National Destination Code (NDC) that routes calls to fixed-line subscribers within the Gunung Tua exchange area.
Dialing Formats
For callers within Indonesia, the trunk prefix '0' is used before the area code. Thus, local calls to Gunung Tua are dialed as 0 635 XXX XXXX, where the subscriber number typically consists of 7 to 8 digits. For international callers, the format is +62 635 XXX XXXX (or 0062 635 XXX XXXX from many countries). It is important to omit the leading '0' when dialing from abroad.
Caller Instructions
Local callers within Gunung Tua may be able to dial just the subscriber number for calls within the same exchange, depending on the local network configuration. However, for calls from other Indonesian cities, the full national format (0 635 ...) is required. International callers should always use the plus sign (+) or the appropriate international access code (e.g., 011 from the US, 00 from most European countries) followed by the country code 62 and the area code without the leading zero.
Network and Regulatory Notes
As a geographic number, the 635 prefix is tied to a specific physical location, and calls are routed via the PSTN or VoIP networks that interconnect with the Indonesian public switched telephone network. The allocation is managed by the Indonesian Telecommunication Regulatory Authority (BRTI) under the Ministry of Communication and Informatics. Subscriber numbers under this prefix are primarily used for fixed-line services, though some VoIP providers may offer numbers with this prefix for virtual presence in the area. When dialing from abroad, be aware of time zone differences (Indonesia Western Time, UTC+7) and potential international call charges.