business phone · 7 min read
How to Call Thailand from the US
Dial 011 + 66 + area code (drop leading 0) + local number. Full guide: Bangkok, Chiang Mai, mobile prefixes, ICT time zone, and VoIP calling costs.
To call Thailand from the US, dial 011 + 66 + area code without the leading 0 + local number. Bangkok example: 011-66-2-123-4567. Thai mobile example: 011-66-81-234-5678. The 011 is the US exit code; 66 is Thailand’s country code assigned by the ITU.
This guide covers every format — Bangkok landline, Chiang Mai office, Phuket resort, Thai mobile — plus the time zone math, cost comparison, and the LINE-vs-WhatsApp reality that trips up US businesses calling Thailand for the first time.
How to dial Thailand from the US
The formula never changes regardless of which Thai city or mobile carrier you are reaching:
- Dial 011 — the US international exit code. Every international call from a US landline starts here. On a US mobile, you can long-press 0 to enter
+as a shortcut, which substitutes for 011. - Dial 66 — Thailand’s country code.
- Dial the area code or mobile prefix without its leading 0. Bangkok’s area code is written 02 in Thailand but you dial just 2. A mobile number beginning 081 becomes 81 after you drop the 0.
- Dial the local subscriber number in full.
- Press call.
Full pattern: 011 66 [area code or mobile prefix minus leading 0] [local number]
From a US mobile that supports E.164: +66 [area code or mobile prefix minus leading 0] [local number]
Save Thai contacts in +66 format so the number works whether you dial from a US desk phone, mobile, or VoIP softphone without re-formatting.
Thai area codes by major city and mobile prefixes
Landline area codes
| City / Region | National format | Dial from US |
|---|---|---|
| Bangkok | 02 | 011 66 2 |
| Chiang Mai | 053 | 011 66 53 |
| Phuket | 076 | 011 66 76 |
| Pattaya / Chon Buri | 038 | 011 66 38 |
| Krabi | 075 | 011 66 75 |
| Hua Hin / Prachuap Khiri Khan | 032 | 011 66 32 |
| Hat Yai / Songkhla | 074 | 011 66 74 |
| Udon Thani | 042 | 011 66 42 |
Bangkok landline numbers are 7 digits after the area code, giving 9 digits total in national format (02 + 7 digits). Most other cities use 7-digit local numbers as well.
Mobile prefixes
Thai mobile numbers are 10 digits in national format including the leading 0 (for example, 081 234 5678). After dropping the 0, you dial 9 digits after 011 66.
Mobile numbers begin with 8 or 9 (the digit after the trunk 0). Major carrier families:
- AIS (Advance Info Service): 061, 062, 063, 080, 081, 082, 083, 084, 085
- True Move H (includes former dtac, merged 2023): 086, 087, 088, 089, 091, 092, 093, 095
- NT Mobile / CAT Telecom: 060
You do not need to know which carrier owns a number to dial it — the format is the same for all Thai mobiles.
How Thai phone numbering works
Thailand’s numbering plan is administered by the NBTC — National Broadcasting and Telecommunications Commission (nbtc.go.th). The ITU assigned Thailand country code +66 under E.164.
Thai telephone numbers are 9 digits in total (excluding country code), structured as:
- Area code (1–2 digits for landlines, 2 digits for mobiles after trunk prefix) + local subscriber number
The leading 0 in national format is the Thai trunk prefix — the equivalent of the UK’s 0. It is used for domestic routing and must be dropped when dialing from abroad.
Major operators as of 2026: AIS (largest by subscribers), True Move H (formed by merger of True Move and dtac in 2023), and NT Mobile (state-owned). Pages listing dtac as a separate carrier are out of date.
STIR/SHAKEN attestation applies on the US origination side when calling outbound to Thailand over VoIP. DialPhone’s STIR/SHAKEN infrastructure ensures US-originated calls to Thai numbers carry full attestation, reducing the risk of carrier-side call blocking on the US leg.
Time zones: Indochina Time (ICT)
Thailand runs on Indochina Time (ICT) = UTC+7. Thailand does not observe daylight saving time — the offset is fixed every day of the year.
| US time zone | Offset from Thailand | Example |
|---|---|---|
| Eastern (EST, UTC−5) | Thailand is 12 h ahead | 9 AM ET = 9 PM ICT |
| Eastern (EDT, UTC−4) | Thailand is 11 h ahead | 9 AM EDT = 8 PM ICT |
| Central (CST, UTC−6) | Thailand is 13 h ahead | 8 AM CT = 9 PM ICT |
| Mountain (MST, UTC−7) | Thailand is 14 h ahead | 7 AM MT = 9 PM ICT |
| Pacific (PST, UTC−8) | Thailand is 15 h ahead | 6 AM PT = 9 PM ICT |
| Pacific (PDT, UTC−7) | Thailand is 14 h ahead | 7 AM PDT = 9 PM ICT |
Thai business hours are typically 8:30 AM–5:30 PM ICT, Monday–Friday. To reach a Bangkok office during its business hours from the US East Coast, you need to call between 9:30 PM–6:30 AM ET in winter — essentially an overnight window from the US side.
The practical implication for US businesses: scheduled calls and async tools (email, LINE message, VoIP voicemail-to-text) are often more workable than real-time calls unless one party is willing to shift their schedule.
US to Thailand calling costs
| Method | Approximate rate | Notes |
|---|---|---|
| US carrier per-minute (no plan) | $0.32–$3.00/min | Varies by carrier; mobile destinations often higher |
| Carrier international add-on | $0.10–$0.30/min | Requires monthly add-on fee ($5–$15/mo) |
| Calling card / prepaid | $0.05–$0.15/min | Variable quality; hidden connection fees common |
| VoIP (e.g., DialPhone) | Under $0.05/min | No monthly minimum; consistent quality |
| App-to-app (LINE, WhatsApp) | Free with internet | Both parties need the app and internet connection |
For occasional calls — under 10 minutes a month — the carrier per-minute rate is acceptable. For US businesses with regular Thailand contact, a VoIP plan pays for itself in the first month. DialPhone’s business phone covers outbound calling to Thailand at per-minute VoIP rates with no international plan surcharge. See DialPhone pricing for current Thailand rates by plan.
If you need a Thai virtual number so Bangkok customers can reach you on a local number, that is separate from per-minute outbound rates — contact DialPhone for DID availability in Thailand.
Calling Thai mobile vs landline — and LINE dominance
Thai mobiles follow the same 011 66 [9-digit prefix + number] format as landlines — there is no special prefix or separate exit code for mobile. The distinction for US callers is cost: most carrier rate sheets charge slightly more to Thai mobiles than to Thai landlines.
More important for business callers: LINE is the dominant communication platform in Thailand, not WhatsApp. Thailand has one of the highest LINE penetration rates in Asia. Thai businesses commonly share a LINE ID alongside or instead of a phone number. WhatsApp has limited but growing usage in Thailand, primarily in international business contexts.
Practical implication for US businesses: when reaching out to a Thai supplier, manufacturer, or partner, ask for their LINE ID in addition to their phone number. Voice calls are still standard for formal business, but follow-up, documents, and day-to-day coordination often happen on LINE.
For US businesses with Thai-speaking customer segments — particularly in tourism, import/export, and the Thai-American diaspora — DialPhone’s AI receptionist can handle inbound calls in multiple languages, including Thai-language routing workflows.
SMS to Thailand and business use cases
Standard US carrier SMS to Thai mobile numbers follows the same E.164 format: +66 [9-digit number]. Delivery rates are high for the major carriers (AIS, True Move H). Two-way SMS works between US VoIP numbers and Thai mobiles, though delivery can take 30–90 seconds for international routing.
Key US-Thailand business sectors where outbound calling volume is significant:
- Automotive parts and electronics manufacturing — Thailand is a major production hub; US OEM buyers and procurement teams make frequent supplier calls to Bangkok, Rayong, and Chon Buri industrial zones.
- Tourism and hospitality — US travelers booking Thai hotels, tour operators, and visa services call Bangkok and Phuket area codes regularly.
- US retiree and expat communities — Chiang Mai (area code 53) and Hua Hin (area code 32) are major hubs for US retirees; family members and financial advisors in the US call these areas frequently.
- US-Thailand trade and import — Thai exporters (food products, textiles, gems) have US buyer contacts who call regularly.
For number porting needs when consolidating existing business phone lines onto a VoIP plan that covers Thailand outbound, DialPhone supports port-in from all major US carriers.
For context on how we handled the same guide for UK international dialing, see How to Call the UK from the US.
FAQ
Calling Thailand FAQ
What is the country code for Thailand?
Thailand's country code is +66. From a US landline or mobile, you reach it by dialing the US exit code 011 first, making the full prefix 011 66. From a US mobile that supports E.164 dialing, you can substitute + for 011 and dial +66 directly.
Do I drop the leading 0 when calling Thailand from the US?
Yes — always. Thai numbers are written with a leading 0 in local format (for example, 02 123 4567 for Bangkok or 081 234 5678 for a mobile). That leading 0 is Thailand's domestic trunk prefix and is only used for calls within Thailand.
When calling from the US, drop the 0 and replace it with 011 66. So 02 123 4567 becomes 011 66 2 123 4567, and 081 234 5678 becomes 011 66 81 234 5678.
How do I call a Thai mobile from the US?
Thai mobile numbers begin with 8 or 9 in their national format after the leading 0 (for example, 081, 082, 089, 091, 095). Drop the leading 0 and dial 011 66 followed by the remaining 9 digits.
Example: 081 234 5678 → 011 66 81 234 5678. The call connects to whichever Thai carrier (AIS, True Move H, or NT Mobile) owns that number range.
What time zone is Thailand in?
Thailand is on Indochina Time (ICT), UTC+7. Thailand observes no daylight saving time, so the offset is fixed year-round. When the US Eastern time zone is on EST (UTC−5), Thailand is 12 hours ahead. When Eastern is on EDT (UTC−4), Thailand is 11 hours ahead.
US Pacific is 15 hours behind Thailand in winter and 14 hours behind in summer. A 9 AM Pacific call lands at 11 PM–midnight in Bangkok — outside business hours.
How much does it cost to call Thailand from the US?
Standard US carrier per-minute rates to Thailand typically run $0.32–$3.00 per minute depending on carrier and whether you are calling a landline or mobile. Carrier international add-on packages reduce this but add a monthly fee.
VoIP providers charge significantly less — often under $0.05 per minute — with no monthly minimum. For businesses with regular Thailand call volume, a VoIP plan pays for itself quickly.
Is WhatsApp popular in Thailand for business calls?
WhatsApp is not the dominant messaging or calling app in Thailand. LINE is the primary platform used by Thai consumers and many businesses for messaging and voice calls. If you are contacting a Thai business contact or customer, LINE is the app to expect them to use.
For formal business calls, a direct phone call or VoIP call remains standard. WhatsApp has some usage in Thailand, particularly in international business contexts, but it is not the default the way it is in, say, the UK or Mexico.
Can I call Thai toll-free numbers from the US?
Generally no — Thai toll-free numbers (1800 prefix) are free only when dialed from inside Thailand. Calling them from the US either fails to connect or connects at a standard international rate, which can be higher than calling a geographic number. Use the company's geographic Bangkok number (area code 2) or their international contact number instead.
What is the dialing format for Bangkok from the US?
Bangkok uses area code 02 in Thailand's national format. Drop the leading 0 and dial: 011 66 2 [7-digit local number]. Example: a Bangkok office number written as 02 123 4567 is dialed from the US as 011 66 2 123 4567.
Start making Thailand calls on a VoIP plan
If your team calls Thailand regularly, a per-minute VoIP rate under $0.05/min beats any carrier add-on plan. DialPhone business phone includes outbound Thailand calling at VoIP rates with STIR/SHAKEN compliance on the US leg.
- Start a free trial — no credit card required
- View DialPhone business phone
- See all pricing
About the author
Growth Operations Lead at DialPhone
Darshan leads Growth Operations at DialPhone, where he owns three interconnected programs: the comparison content operation, the open VoIP Pricing Dataset, and the test-call methodology used to verify every pricing claim published on the site.
His research process starts with hands-on product trials and live vendor quotes — not marketing pages. Pricing figures are cross-checked against actual invoices and re-verified on a rolling quarterly cycle, with the underlying dataset kept public for independent re-verification. That dataset now covers 40+ VoIP and virtual-number providers across the US and Canada market.
Darshan also leads DialPhone's AI receptionist evaluation program, running structured test-call scenarios across English, Spanish, and French to assess transcription accuracy, intent routing, and escalation behavior. Methodology notes and raw scoring are archived in the research section.
For factual corrections or dataset discrepancies, Darshan can be reached at the DialPhone editorial address. Verified corrections are published as errata with a changelog date — no silent edits.