Thailand Country Phone Code, Area Codes & Mobile Carrier USSD Guide (AIS, True, DTAC)

What is the Thailand Country Phone Code? (+66 Explained)

The international country dialing code for Thailand is +66. It was assigned under the ITU-T Zone 6 numbering plan for Southeast Asia and Oceania. When dialing a Thai telephone number from outside the country, +66 replaces the domestic long-distance trunk prefix (0).

For example, if a hotel in Bangkok gives their domestic telephone number as 02-123-4567, you dial +66 2 123 4567 from a mobile phone, or 0066 2 123 4567 from European landlines, or 011 66 2 123 4567 from the United States and Canada.

Similarly, if a contact in Thailand gives their mobile number as 089-987-6543, the correct international E.164 dialing format is +66 89 987 6543.

Thailand Area Codes: Bangkok, Phuket, Chiang Mai & Pattaya Directory

Fixed-line telephone numbers in Thailand consist of a 1-digit or 2-digit area code followed by a 6-digit or 7-digit local subscriber number. When dialing domestically, add a leading zero (0). When dialing internationally, omit the leading zero.

Major Thailand area codes include:

• Bangkok, Nonthaburi, Pathum Thani, Samut Prakan: Area Code 02 (International: +66 2)

• Chiang Mai, Chiang Rai, Lamphun, Mae Hong Son: Area Code 053 (International: +66 53)

• Phuket, Phang Nga, Krabi: Area Code 076 (International: +66 76)

• Chonburi, Pattaya, Rayong: Area Code 038 (International: +66 38)

• Surat Thani, Koh Samui, Koh Phangan: Area Code 077 (International: +66 77)

• Songkhla, Hat Yai: Area Code 074 (International: +66 74)

• Nakhon Ratchasima (Korat): Area Code 044 (International: +66 44)

• Udon Thani, Nong Khai: Area Code 042 (International: +66 42)

• Phitsanulok, Sukhothai: Area Code 055 (International: +66 55)

Thai Mobile Phone Numbers: Prefixes and Structure

Unlike landlines that are tied to geographic regions, mobile phone numbers in Thailand are non-geographic and can be used anywhere in the country. Mobile numbers consist of 10 digits domestically, beginning with prefixes 06, 08, or 09.

Common mobile prefix allocations in Thailand include:

• 081, 082, 087, 092, 093, 097: Originally allocated to AIS (Advanced Info Service).

• 086, 089, 090, 091, 095, 096: Originally allocated to TrueMove H.

• 080, 083, 084, 085, 088: Originally allocated to DTAC (Total Access Communication).

Following the merger of True Corporation and DTAC, the two networks operate as True-DTAC, but legacy SIM profiles and specific USSD service codes remain distinct.

Official Thailand Telecom USSD Codes: AIS, TrueMove H, DTAC

Prepaid tourist SIM cards (such as AIS 5G Tourist SIM, TrueMove H Tourist Infinite, or Happy Tourist DTAC) are sold at Bangkok Suvarnabhumi Airport (BKK), Don Mueang (DMK), Phuket Airport (HKT), and convenience stores like 7-Eleven. Use these official USSD service codes to manage your account:

AIS (Advanced Info Service):

• Check Main Airtime Balance & Validity: Dial *121# and press Call (Free, instant onscreen display).

• Check Remaining Internet Data: Dial *121*32# or *121*3# and press Call.

• Check Your Own Mobile Number: Dial *545# and press Call (displays your Thai phone number on screen).

• Top Up / Scratch Card Voucher: Dial *120*16_DIGIT_PIN# and press Call.

• Switch Language to English: Dial *118# or call 1175.

• AIS Customer Call Center: Dial 1175.

TrueMove H:

• Check Airtime Balance: Dial #123# and press Call.

• Check Active Internet Quota: Dial *900# and press Call (Free SMS report received within seconds).

• Check Your Own Mobile Number: Dial *933# and press Call.

• Top Up via Cash Card: Dial *123*14_DIGIT_PIN# and press Call.

• True Customer Support: Dial 1242.

DTAC (Total Access Communication):

• Check Main Balance: Dial *101*9# and press Call.

• Check Internet Data Balance: Dial *101*1# and press Call.

• Check Your Own Mobile Number: Dial *102*9# and press Call.

• Top Up via Refill Card: Dial *100*16_DIGIT_PIN# and press Call.

• DTAC Customer Support: Dial 1678.

Emergency and Important Assistance Phone Numbers in Thailand

When traveling in Thailand, keep these vital national emergency numbers stored in your contacts. These numbers can be dialed from any operational mobile phone, even with zero balance:

• 1155 — Tourist Police (English, Chinese, and European language support for travelers nationwide).

• 191 — General Police Emergency (Domestic law enforcement).

• 1669 — Emergency Medical Services & Ambulance (National medical dispatch).

• 199 — Fire & Rescue Department.

• 1193 — Highway Police (Assistance on intercity expressways and highways).

• 1133 — Directory Assistance.

How to Call Internationally from Thailand (Cheap IDD Prefixes)

When placing an international call from a Thai SIM card to your home country, dialing the standard "+" or "001" connects through premium high-definition international routes. However, Thai mobile operators offer discounted VoIP IDD prefixes for low-cost international calling:

• AIS Economy IDD: Dial 003 + Country Code + Number (e.g. 003 1 212 555 0199 for the USA).

• TrueMove H Economy IDD: Dial 006 + Country Code + Number.

• DTAC Economy IDD: Dial 004 + Country Code + Number.

Using these economy prefixes can lower international calling charges by up to 80% compared to standard international direct dialing.