This free Thai phone number checker shows whether a number is valid.
A Thai phone number checker tells you whether a number is real, which means it follows Thailand's numbering rules and is assigned. Enter a +66 number above and 1Lookup's free checker returns valid or invalid in seconds, with the line type and country, checked against Thailand's numbering plan.
Pick the country, then enter the number without the country code.
Free & rate-limited. No signup required to try.
- Country code
- +66
- Mobile numbers
- 9 digits after +66, or 10 written at home, starting 06, 08 or 09
- Landlines
- 8 digits after +66, starting 02, 03, 04, 05 or 07, such as +66Â 2Â XXXÂ XXXX
- Written at home
- 081 234 5678
- Written for apps and SMS
- +66812345678
- Dialed from the US
- 011 66 81 234 5678
A Thai mobile number is +66 followed by 9 digits, and the first one is 6, 8 or 9.
Written with the country code
- +66Country code
- 8Mobile start
- 1 234 56788 more digits
Written at home
- 0Replaces +66
- 8Mobile start
- 1 234 56788 more digits
The +66 and the 0 do the same job, so a number is never written with both.
A Thai phone number checker reads a number's format first and then checks it against Thailand's numbering plan.
This is the path one check takes. A number can be written correctly and still not be assigned to anyone, so the format check alone is not the answer.
- You enter the numberType it the way it is written at home, such as 081 234 5678, or paste it with +66.
- Its format is checkedEach type of number has its own rules. A mobile needs 9 digits after +66 and starts with 06, 08 or 09 at home.
- It is checked against the numbering planNumbers outside the US and Canada are checked against the numbering plan of their country, which for this page is Thailand's.Nothing is sent to the number, so it never rings and its owner is never told.
- You see valid or invalidWith the line type and country in a few seconds, and the carrier or network where one is listed.
A Thai mobile number has 9 digits after +66 and starts with 06, 08 or 09, so any other length is not a valid mobile.
These lengths come from the numbering data for Thailand. A mobile number has 10 digits when it is written at home with its 0. A mobile has 9 digits after +66 and a landline has 8, so the length alone gives the type, and the first digits confirm it: 06, 08 or 09 for a mobile and 02, 03, 04, 05 or 07 for a landline. NBTC's plan of 2020 sets 10-digit landlines for the future, and its notice of May 2024 says that change comes only when numbers run short. The ITU table also lists the older Bangkok codes 010, 016, 018 and 019.
| Number type | Starts with at home | Digits after +66 | Written at home |
|---|---|---|---|
| Mobile | 06, 08 or 09 | 9 | 081 234 5678 |
| Landline | 02, 03, 04, 05 or 07 | 8 | 02 XXX XXXX |
The first digits after +66 show whether a Thai number is a mobile, a landline or a VoIP number, and mobiles have 9 digits while landlines have 8.
Thailand's regulator, the National Broadcasting and Telecommunications Commission (NBTC), published its numbering plan in the Royal Gazette on 20 January 2020 and filed it with the ITU, which updated the filing on 8 May 2024. Written at home, every number starts with 0, and the 0 is dropped after +66. The ITU table lists 089 as a VoIP range, while NBTC's gazette notice puts every 08X range under mobile.
| After +66 | Written at home | What the plan assigns it to | Digits after +66 |
|---|---|---|---|
| 2 | 02 | Landline, Bangkok, Nonthaburi, Pathum Thani and Samut Prakan | 8 |
| 32 to 39 | 032 to 039 | Landline, central and eastern provinces | 8 |
| 42 to 45 | 042 to 045 | Landline, north-eastern provinces | 8 |
| 52 to 56 | 052 to 056 | Landline, northern provinces | 8 |
| 73 to 77 | 073 to 077 | Landline, southern provinces | 8 |
| 60 | 060 | VoIP, which are internet voice numbers, nationwide | 9 |
| 61 to 66 | 061 to 066 | Mobile, nationwide, in NBTC's gazette notice | 9 |
| 80 to 88 and 90 to 99 | 080 to 088 and 090 to 099 | Mobile, nationwide | 9 |
| 89 | 089 | VoIP in the ITU filing and mobile in NBTC's gazette notice | 9 |
| Not given | 1800 to 1809 | Toll-free services | 10 at home |
| Not given | 1900 to 1909 | Premium-rate services, which charge a special rate | 10 at home |
| Not given | 191 to 199 | Emergency numbers, where 191 is the national emergency number | 3 |
Thailand had 109,606,103 registered mobile numbers at the end of September 2025, which is 5.5% fewer than a year earlier and 17.3% fewer than the peak in March 2020.
NBTC counts registered mobile numbers, not people, from data the operators report each quarter, and the count has no split between prepaid and postpaid. It peaked at 132,594,791 in March 2020 and fell by 12.7 million in the third quarter of 2020, and the dataset gives no reason for that fall.
| Period | Registered mobile numbers | Change on a year earlier |
|---|---|---|
| End of 2019 | 129,613,743 | +3.6% |
| March 2020 | 132,594,791 | +8.5% |
| End of 2020 | 116,294,420 | -10.3% |
| End of 2021 | 120,849,606 | +3.9% |
| End of 2022 | 126,413,958 | +4.6% |
| End of 2023 | 120,920,796 | -4.3% |
| End of 2024 | 115,126,899 | -4.8% |
| September 2025 | 109,606,103 | -5.5% |
The average Thai mobile number made 54% fewer outgoing call minutes a month in the first quarter of 2024 than in the first quarter of 2018, falling from 174.5 minutes to 80.3.
NBTC reports the average minutes of outgoing calls per mobile number per month, for all numbers together and, until the first quarter of 2024, for prepaid and postpaid numbers separately. The series for all numbers drops 19% from 80.3 to 64.9 minutes in the second quarter of 2024 and the dataset does not say why, so the rows after that point are shown apart.
| Quarter | All numbers | Prepaid numbers | Postpaid numbers |
|---|---|---|---|
| Q1 2018 | 174.5 | 129.3 | 328.2 |
| Q1 2019 | 133.6 | 101.5 | 232.6 |
| Q4 2020 | 110.0 | 77.5 | 191.3 |
| Q4 2021 | 96.5 | 66.6 | 175.2 |
| Q4 2022 | 83.9 | 53.9 | 153.8 |
| Q4 2023 | 81.0 | 56.1 | 141.1 |
| Q1 2024 | 80.3 | 56.1 | 139.1 |
| Q2 2024 | 64.9 | Not reported | Not reported |
| Q1 2025 | 62.8 | Not reported | Not reported |
Thai police logged 773,118 online crime cases worth 79.57 billion baht between 1 March 2022 and 31 December 2024, and phone threats were one of the five most common types.
The Royal Thai Police online reporting centre has counted complaints since it opened on 1 March 2022, and Thai PBS printed its running totals to the end of 2024. The five most common types below make up 82.9% of all the cases. The police list threats made by phone as a type of their own, called "Call Center", and they list scam texts under no type of their own.
| Type of case | Cases | Damage in baht |
|---|---|---|
| Fake buying and selling of goods or services | 365,075 | 5,035,793,009 |
| Tasks and extra income scams | 98,139 | 12,259,745,775 |
| Loan scams that never pay out | 74,147 | 3,586,095,339 |
| Investment scams run through a computer | 51,881 | 28,441,508,012 |
| Threats made by phone, called Call Center | 51,678 | 10,761,310,285 |
Three common mistakes make a Thai number fail the check, and each one is quick to fix.
Keeping the 0 after +66 adds a digit.
The 0 is only for dialing inside Thailand, so +66 081 234 5678 is wrong. Drop the 0 and write +66 81 234 5678.
Typing too few or too many digits makes a number invalid.
A mobile number has 9 digits after +66. With 8 or 10 it cannot be a valid mobile, so look for a missing or doubled digit.
Leaving the wrong country selected changes how the number is read.
The checker reads a number by the rules of the country selected above, so keep Thailand selected for a +66 number. Paste a number with its + and country code and the country is read from the number itself.
These are the questions people ask most about checking Thai phone numbers.
How do I check if a Thai phone number is valid?
Enter the number in the box above with Thailand selected. The free checker returns valid or invalid in seconds, with the line type and country. Type it the way it is written at home, such as 081 234 5678, or in full as +66 81 234 5678.
How many digits is a Thai phone number?
A mobile number has 9 digits after +66, or 10 written at home. A landline has 8 digits after +66, such as +66 2 XXX XXXX.
What does a Thai mobile number start with?
Mobile numbers start with 06, 08 or 09 at home, which is 6, 8 or 9 after +66.
How do I write a Thai number for an app or an SMS tool?
Use the E.164 form: a plus sign, 66, then the number without its leading 0 and no spaces, such as +66812345678.
Does the Thai phone number checker show the carrier?
It shows the carrier or network where one is listed. Numbers outside the US and Canada are checked against the numbering plan of their country rather than live carrier data, so some come back with no carrier name.
Does valid mean the Thai number is active?
No. Valid means the number is real, correctly written for Thailand and assigned. Whether a line is switched on and reachable right now is a different question, and the free HLR lookup answers it.
Can I check a whole list of Thai phone numbers?
Yes. This free tool checks one number at a time. A 7-day free trial opens CSV upload and the API, at 1 credit a number.
Does the person know I checked their number?
No. The check reads records only. No call or text goes to the number, so its owner is never told.
How do I dial a Thai number from abroad, and how do I dial abroad from Thailand?
From abroad, dial the exit code of the country you are in, then 66, then the number without its leading 0, so 081 234 5678 becomes +66 81 234 5678 and a Bangkok landline written 02 XXX XXXX becomes +66 2 XXX XXXX. From Thailand, NBTC's plan sets international access codes of 3 digits starting 00 or 10 for premium-quality voice and of 5 digits for standard service, followed by the country code.
Why do Thai landlines have 8 digits after +66 when the plan says 10?
NBTC's plan of 2020 sets 10-digit landlines, written 0 and 9 more digits at home, and it moved that change to 1 January 2025. Its notice of May 2024 then said fixed line providers will build 10-digit service within two years, and only when the supply of fixed line or mobile numbers is considered insufficient, so landlines still have 8 digits after +66, or 9 written at home with the 0.
Can I tell which network a Thai mobile number is on from its digits?
No. NBTC's plan reserves 068 as a routing code for number portability, which is the service that lets a subscriber keep a number and change network, so the first digits do not show where a number is today. The free HLR lookup shows the network a mobile number is on now.
How many mobile numbers does Thailand have?
NBTC counted 109,606,103 registered mobile numbers at the end of September 2025, which is 5.5% fewer than a year earlier. It counts numbers and not people, so one person with two SIM cards is counted twice.
Has Thailand cut off mobile numbers used for fraud?
Yes. NBTC's acting Secretary-General said on 7 April 2026 that the office had suspended more than 234,721 mobile numbers for abnormal use between 8 November 2025 and 17 March 2026, and NBTC's rule from 16 January 2024 makes anyone holding 6 or more SIM cards come in and show who they are.
How do I report a scam call or stop advertising texts in Thailand?
The police Anti Online Scam Operation Centre takes calls on 1441, 24 hours a day, and NBTC's call centre takes complaints on 1200 free of charge. To stop advertising texts, NBTC's chairman said in January 2024 that a person can dial *137 for free.
You can check numbers from other countries on their own pages.
- +61Australian phone number checkerCheck numbers from Australia
- +1Canadian phone number checkerCheck numbers from Canada
- +44UK phone number checkerCheck numbers from the UK
- +353Irish phone number checkerCheck numbers from Ireland
- +91Indian phone number checkerCheck numbers from India
- +65Singapore phone number checkerCheck numbers from Singapore
- +234Nigerian phone number checkerCheck numbers from Nigeria
- +64New Zealand phone number checkerCheck numbers from New Zealand
- +60Malaysian phone number checkerCheck numbers from Malaysia
These free tools answer the next question about a number.
- The +66 country code pageHow to dial Thailand, the time there now and the landline places.
- HLR lookupCheck whether a mobile number is switched on and reachable right now.
- Line type lookupSee whether a number is a mobile, a landline or VoIP.
- Carrier lookupFind the carrier or network behind a number.
- Phone validator for any countryThe same check with the country picker open to every country.
- Phone validation APIRun the same check from your own software, one request per number.
Sources: Google's libphonenumber numbering data for lengths, mobile starts and landline starts, as of September 24, 2026; the ITU list of country codes.