Telephone numbers in Thailand
Telephone numbers in Thailand are regulated by the Ministry of Information and Communication Technology (MICT).
Geographic area codes
Geographic (fixed line) area codes are, excluding the STD prefix 0, one digit in Bangkok and nearby provinces (area code 2) and two digits in provincial (area codes 3x, 4x, 5x, and 7x). In Thailand, an area code is usually shared by multiple provinces and roughly follows province borders.
Fixed line subscriber numbers are six digits in Thailand (except Bangkok, Nonthaburi, Pathum Thani and Samut Prakan, i.e. area code 2). Prior to 1980, subscriber numbers were six digits in Bangkok, Nonthaburi, Pathum Thani and Samut Prakan. From 1980, subscriber numbers in these areas were expanded to seven digits in phases to meet new demands. The first digit of a subscriber number is associated with a specific area in the area code. In Bangkok, Nonthaburi, Pathum Thani and Samut Prakan, the second digit of a subscriber number identifies the service provider, which is almost always Telephone Organization of Thailand (TOT), as TOT holds a near-monopoly of the Thai fixed line market.
Thus, a full national number is 9 digits, including the STD prefix 0. When writing a telephone number with the area code, the area code and subscriber number is separated with a hyphen, also in the middle of subscriber number. Examples:
- A number 2134567 in Bangkok: 02-2134567
- A number 213456 in Nakhon Ratchasima: 044-213456
Thailand switched to closed dialing plan in 2001, which means calling within the area code requires the area code to be dialed. e.g. When calling a number 2134567 in Bangkok (02) from a fixed line phone:
- Within Bangkok, Nonthaburi, Pathum Thani and Samut Prakan: 02-2134567
- Outside Bangkok, Nonthaburi, Pathum Thani and Samut Prakan: 02-2134567
- Outside Thailand: +66-2-2134567 (the initial 0 of the area code is omitted)
02 Bangkok (Krung Thep Maha Nakhon), Nonthaburi, Pathum Thani, Samut Prakan & Phutthamonthon (Nakhon Pathom) 032 Phetchaburi, Prachuap Khiri Khan & Ratchaburi 034 Kanchanaburi, Nakhon Pathom (except Phutthamonthon), Samut Sakhon & Samut Songkhram 035 Ang Thong, Phra Nakhon Si Ayutthaya & Suphan Buri 036 Lop Buri, Saraburi & Sing Buri 037 Nakhon Nayok, Prachin Buri & Sa Kaeo 038 Chachoengsao, Chon Buri & Rayong 039 Chanthaburi & Trat 042 Bueng Kan, Loei, Mukdahan, Nakhon Phanom, Nong Bua Lamphu, Nong Khai, Sakon Nakhon & Udon Thani 043 Kalasin, Khon Kaen, Maha Sarakham, Roi Et & Nam Nao (Phetchabun) 044 Buri Ram, Chaiyaphum, Nakhon Ratchasima & Surin 045 Amnat Charoen, Si Sa Ket, Ubon Ratchathani & Yasothon 053 Chiang Mai, Chiang Rai, Lamphun & Mae Hong Son 054 Lampang, Nan, Phayao & Phrae 055 Kamphaeng Phet, Phitsanulok, Sukhothai, Tak, Uttaradit, Sam Ngam & Wachirabarami (Phichit) 056 Chai Nat, Nakhon Sawan, Phetchabun (except Nam Nao), Phichit (except Sam Ngam & Wachirabarami) & Uthai Thani 073 Narathiwat, Pattani & Yala 074 Phatthalung, Satun & Songkhla 075 Krabi, Nakhon Si Thammarat & Trang 076 Phang Nga & Phuket 077 Chumphon, Ranong & Surat Thani
Mobile phone codes and IP telephony
Mobile phone codes are in the area code 8 and 9, and VoIP are in the area code 6, ranging 2 digits excluding the leading zero.
Originally, each mobile phone operator is issued one mobile phone code. Through a series of mergers, there are currently three major mobile phone operators: AIS, True and DTAC. As existing numbers begin to run out, the three mobile phone operators are assigned numbers in 081 code distinguished by the first digit of the subscriber number.
A mobile phone number consist of a mobile phone code and a seven-digit subscriber number. Therefore, a mobile phone number is written as 08x-xxxxxxx.
Mobile phones in Thailand uses 900/1800 MHz for GSM. Domestic roaming service is available free within Thailand in places where there is only a single transmitter in place due to restrictions.
As codes are being exhausted, a new range, 09x is made available for assignment. Despite the length of the code, subscriber numbers are seven digits, resulting in an 10-digit national number including the leading zero. Starting 28 April 2011, the prefix 090 followed by 7 digits would be available for use.
060 True Move (VoIP) 068 TOT (VoIP) 080-0 to 080-2 AIS 080-3 True Move 080-4 to 080-5 DTAC 080-6 AIS 081-0 to 081-2 AIS 081-3 to 081-6 DTAC 081-7 to 081-9 AIS 082 AIS 083 True Move 084 AIS 085 DTAC 085-4 AIS 086 True Move 087 AIS 088 True Move 089 DTAC 090 DTAC 090-1 AIS 090-9 True Move H 091 DTAC
Non-geographical short codes and special numbers
100 Universal operator service (formerly fixed telephone & facsimile fault report) 101 Operator assistance for domestic calls (to be combined to 100) 102 Operator service assistance (to be combined to 100) 1100 TOT 1112 The Pizza Company 1133 Fixed telephone directory assistance 1155 Tourist Police 1188-xxx-xxxx Paging service (now abolished) 1193 Highway Police 1401-xxx-xxx Toll-free numbers 1580 Upcoming flights on Suvarnabhumi Airport 1581 Upcoming flights on other airports 1669 Medical Emergency Call 1691 Ambulance Service Center 1800-xxx-xxx Toll-free numbers (from landlines only) 1900-xxx-xxx Premium-rate telephone number 191 Universal emergency service 199 Fire Department
Recently, the MICT announced the mobile number portability (MNP) service for mobile carriers. Thus, subscribers are allowed to retain their mobile numbers when they switch to another service provider, in a bid to increase market competition. Therefore, the mobile number prefix only indicates the original service provider.