phones Country calling codes · EN / 中文
🇹🇭

Thailand +66

International code · Asia

How to dial

Calling from abroad +66 81 234 5678

Dial +66, then the local number. Drop the leading trunk prefix 0. E.g. the landline 02 123 4567 is dialled from abroad as +66 2 123 4567. Generate the full number →

Calling a mobile locally 081 234 5678

For domestic long distance dial 0 first, then the area code. Local calls: dial directly. Mobiles are dialled with the leading 0 as well.

Mobile length
9 digits
Mobile prefixes
XX XXX XXXX
Landline format
0X XXX XXXXe.g. 02 123 4567
International format
+66 X XXX XXXX
Domestic trunk
0

Sign-up availability

What to expect when signing up for these services with a physical SIM from this country:

ChatGPT Works
Claude Works
WhatsApp Works
Telegram Works
LINE Works
WeChat Works
X Works
TikTok Works
Gemini Works

Applies to every platform: VoIP / virtual numbers and heavily-reused number pools get rejected. Physical SIM only.

Checked 2026-09-12. Platform region policies and number-range allocations change — always confirm against each platform’s official supported-regions list and the carrier’s notices.
2 sources
help.openai.com/articles/7947663support.google.com/gemini?p=gemini_web_availability

How to read a number

+66812345678

+66Country code
Thailand.
81Mobile prefix
Written 081 domestically — the 0 is the trunk prefix; 06, 08 and 09 are all mobile, allocated to carriers in blocks, with number portability.
2345678Subscriber number
7 digits.

Domestic format: 081-234-5678. Landlines are one digit shorter, e.g. Bangkok 02-123-4567, dialled from abroad as +66 2 123 4567.

This section checked 2026-09-13.
2 sources
www.letsdial.com/blog/thailand-phone-number-formatwww.nationthailand.com/business/30304311

Number ranges & quality

RangeTypeNotes
Starts with 06 / 08 / 09 (9 digits, including the leading 0) Mobile carrier Thai mobile ranges.
Intl SMSStable
Virtual-number riskLow
ID requiredA passport is required, with at most three SIMs per operator for foreigners; tourist SIMs last at most 60 days and can’t be extended.

Physical SIMs can sign up without issues. LINE is the mainstream messaging app in Thailand.

Carriers & prefixes

Mobile prefixes by carrier.

Number portability applies — a prefix only shows the original carrier.

  • AIS Mobile carrier
  • True (incl. former dtac) Mobile carrier

    Merged with dtac in March 2023.

  • National Telecom (NT) Mobile carrier

    Formed in 2021 from TOT and CAT.

This section checked 2026-09-13.
2 sources
www.rcrwireless.com/20230302/5g/thai-telcos-true-corp-dtac-complete-merger-processwww.nationthailand.com/business/30304311

SIM cards & keeping a number

Thailand keeps tightening SIM rules: since 18 August 2025 new SIMs and SIM swaps require a face liveness check; foreigners register with a passport, up to three SIMs per operator. Tourist SIMs sold to visitors last at most 60 days and can’t be extended by top-up — continuing requires re-registering with a passport at a shop.

Read more

Regular prepaid SIMs (not tourist SIMs) are friendlier: since 14 May 2026 the NBTC requires a number-retention service — when validity runs out but credit remains, the operator deducts ฿3 every 30 days to add 30 days, up to six times (180 days), with an SMS 3 days before and an opt-out. So to keep a Thai number, get a regular prepaid SIM rather than a tourist SIM and leave some credit on it.

Tourist SIM

Travel SIM
Network
True (incl. former dtac) / AIS
Price
Package price as shown on the pack
Keeping the number
True (official): validity follows the package on the pack, up to 60 days; it can’t be extended by top-up after expiry — to continue, re-register with a passport at a True dtac Shop or call the hotline
ID check
Passport; foreigners max three SIMs per brand; face liveness check for new SIMs
SMS & calls
A normal Thai number

Pros

  • Buy at the airport and use on arrival

Watch out

  • 60 days at most — not for keeping a number
3 sources
www.true.th/en/prepaid/sim/touristwww.nationthailand.com/blogs/news/policy/40054768www.biometricupdate.com/202508/thailand-mandates-biometric-liveness-detection-for-sim-registration

Regular prepaid (AIS One-2-Call / True prepaid)

Number-keeping SIM
Network
AIS / True (incl. former dtac)
Price
Depends on top-up; days added per top-up are set by the operator
Keeping the number
NBTC rule (from 14 May 2026, tourist SIMs excluded): when validity expires with credit remaining, ฿3 is deducted every 30 days to add 30 days, up to six times (180 days); SMS notice 3 days before, opt-out available (True: dial *925#). After 180 days without a top-up the line enters the suspension process.
ID check
Passport; foreigners max three SIMs per operator; since May 2026 a registered SIM must be activated within 60 days
SMS & calls
AIS (official): incoming SMS is free while roaming; outgoing SMS is charged by country

Pros

  • Leave some credit and it renews itself for 180 days at ฿3 a month
  • Free incoming SMS abroad (AIS)

Watch out

  • Airport SIMs are usually tourist SIMs — make sure you get a regular prepaid SIM
  • After 180 days you still need to top up to keep the number
  • Inserting it in China triggers roaming data charges — turn data off first

Where to buy: ais.th, true.th

6 sources
www.thairath.co.th/news/governmentpolicy/2932821www.bangkokbiznews.com/news/news-update/1232473aiscallcenter.ais.co.th/ikm/acc/index.php?kmid=KM1140446www.true.th/en/help/mobile/network/prepaid-number-retention-servicewww.ais.th/en/consumers/package/international/roaming/otherslexbangkok.com/thailand-sim-card-rules-2026

From user and blogger reports; platform risk rules change often — treat as a guide only. This section checked 2026-09-15.

Community tips

No community tips yet. We refresh every 1–2 months — contributions welcome.

Have experience to share? Submit →

Other countries

Elsewhere in Asia