Area Code 77 – Chumphon/Ranong/Surat Thani

Geographic Coverage and Administrative Jurisdiction

The Thai national destination code 77 is a geographic area code assigned to the upper southern region of Thailand, encompassing the provinces of Chumphon, Ranong, and Surat Thani. These provinces are administered under the Thai administrative divisions, with Surat Thani serving as a major commercial and transport hub. The code covers both provincial capitals and surrounding districts, including key cities such as Chumphon city, Ranong city, and Surat Thani city, as well as popular tourist destinations like Koh Samui and Koh Pha Ngan (which fall under Surat Thani province).

Dialing Formats and Caller Instructions

For domestic callers within Thailand, the trunk prefix 0 must be dialed before the area code, followed by the local subscriber number. The complete domestic format is 0 77 XXX XXXX (where X represents the local number digits). For example, to call a fixed line in Surat Thani, you would dial 0 77 123 456.

For international callers, the Thai country code +66 replaces the trunk prefix 0. The international dialing format becomes +66 77 XXX XXXX. For instance, from abroad you would dial +66 77 123 456. Note that the leading 0 is omitted when using the international format.

Numbering Plan and Overlay Considerations

Thailand's numbering plan follows ITU-T E.164 recommendations. Geographic area codes are assigned by the National Broadcasting and Telecommunications Commission (NBTC). Currently, area code 77 does not have an overlay code; subscribers within the same province use the same area code. However, due to increasing demand, the NBTC has implemented number expansion measures, and some areas may have 8-digit local numbers. Always verify the current number length when dialing.

Call Routing and Services

Fixed-line services in these provinces are provided primarily by the state-owned TOT and True Corporation, with VoIP and IP-based services also available. Calls to geographic numbers are typically charged at standard local or national rates depending on the caller's location. Emergency services (police, fire, ambulance) are reachable via short codes (e.g., 191, 199) and are not affected by area codes.

For businesses or individuals seeking to establish a presence in Chumphon, Ranong, or Surat Thani, obtaining a local number with area code 77 can enhance local credibility and customer trust. When dialing from a mobile phone within Thailand, the same trunk prefix and area code rules apply, though mobile operators may offer bundled calling plans that include discounted rates to landlines.