Staying connected in Thailand is easy with a DTAC SIM card or eSIM! This guide is specifically designed for tourists like you, visiting the beautiful Land of Smiles in 2024. We’ll break down everything you need to know about DTAC’s prepaid options, including data plans, voice calls, and how to choose between a traditional SIM card and a convenient eSIM. With clear explanations and pricing details, you’ll be surfing the web, sharing photos, and making calls with confidence throughout your Thai adventure. Let’s dive in and find the perfect DTAC connection for you!
Table of Contents
I. What is DTAC?
DTAC, or Total Access Communication Public Company Limited, is one of Thailand’s leading mobile network operators. It was founded in 1989 and is a subsidiary of the Telenor Group, a telecommunications company based in Norway.
Update: A corporate merger between True Corporation and DTAC, Thailand's second- and third–largest mobile network operators, has been in progress since its first public announcement on 22 November 2021. They are now new True Corporation or dtac True Better Together.
Some details statistics about dtac:
- Total subscribers/connections between the duopoly of AIS and TRUE/DTAC was 95.823.700 out of 97.358.700 total connections in the market in Q3 2023.
- After the merge, TRUE increased its market share to more than half the market with 52.77% in 2023.
II. DTAC Mobile Operator Services for Tourists
DTAC provides a wide range of mobile communication services to its customers. These services include:
- Mobile services: Of course, as one of the leading mobile operators in Thailand, dtac offers mobile service with more than 90% coverage in Thailand. Tourists can be ensured a stable mobile internet across Thailand.
- Internet packages: dtac offers both postpaid and prepaid services for users. They also offer mobile data plans customized for tourists with unlimited data and free local calls in Thailand.
- Smartphones and tablets: dtac online store also provides smartphones, tablets, and many other smart devices from many brands like Apple, Samsung, OPPO,… Tourists can easily use this service to purchase a device in Thailand
- Other services: dtac also has some services that a traveler can refer to such as roaming services, dtac wifi, dtac pay,…
Check out more services on dtac official website!
III. DTAC Coverage in Thailand
DTAC has comprehensive network coverage nationwide. The company operates on 4G/LTE networks and is currently working on rolling out its 5G network in Thailand.
DTAC’s network coverage covers over 90% of Thailand’s population, covering all 77 provinces. The company has invested heavily in expanding its network infrastructure to provide customers with high-quality, reliable mobile services.
DTAC’s network coverage is complemented by its extensive network of retail stores and service centers across Thailand. The company has more than 7,000 retail stores and service centers, making it easy for customers to access its services and support anywhere in the country.
With this coverage, dtac provides a stable internet speed across Thailand. When choosing dtac as mobile operator, you can be assured the connection during the trip.
IV. Best DTAC SIM Cards for Tourists
DTAC offers special SIM plans for tourists with the same benefits and different data and prices. You can check out detailed prices and description here: https://www.dtac.co.th/en/prepaid/products/tourist-sim.html
10-days Unlimited Internet 50GB at Max Speed (349 Baht ~ $10):
- Unlimited internet 50GB at 4G/5G max speed
- Free 15-baht credit
- Free 100 mins for calls in Thailand and Free 30 mins for calls to China, HongKong, Macau, Taiwan, India, South Korea and Vietnam
- Unlimited calls among dtac network
- Special international call rate via 00400 from 1 baht/min
- Free 5 chat apps usage (Messsenger, WhatsApp, Kakaotalk, Line, WeChat)
15-days Unlimited Internet 30GB at Max Speed (599 Baht ~ $17,9):
- Unlimited internet 30GB at 4G/5G max speed
- Free 15-baht credit
- Unlimited calls among dtac network
- Special international call rate via 00400 from 1 baht/min
- Free 5 chat apps usage (Messsenger, WhatsApp, Kakaotalk, Line, WeChat)
8-days Unlimited Internet 15GB at Max Speed (299 Baht):
- Unlimited internet 15GB at 4G/5G max speed
- Free 15-baht call credit + 100 baht for calling to other networks in Thailand
- Unlimited calls among dtac network
- Special international call rate via 00400 from 1 baht/min
- Free 5 chat apps usage (Messsenger, WhatsApp, Kakaotalk, Line, WeChat)
Pay-As-You-Go (49 Baht)
- Data: 1GB
- Validity: 1 day
- Free 15-baht call credit
- Unlimited calls among dtac network
- Special international call rate via 00400
- Free 5 chat apps usage (Messsenger, WhatsApp, Kakaotalk, Line, WeChat)
Besides, recently dtac also offers various TRUE unlimited data and long validity plans. You can refer to some plans below:
- dtac Happy Infinite SIM – 8-days Unlimited Internet & Call (449 baht ~$13)
- dtac Happy Infinite SIM – 15-days Unlimited Internet & Call (699 baht ~$20.9)
- dtac Happy Infinite SIM – 30-days Unlimited Internet & Call (1199 baht ~$35.9)
Both 3 SIM plans above include same benefits as below:
- Unlimited 5G at MAX SPEED
- Unlimited call to all Thai networks
- Unlimited dtac wifi
- Free 15-baht credit
Comparison table of dtac SIM cards:
dtac SIM cards
Package | dtac Happy Infinite 8 days SIM Unlimited Internet & Call | dtac Happy Infinite 15 days SIM Unlimited Internet & Call | dtac Happy Infinite 30 days SIM Unlimited Internet & Call | dtac Happy Tourist SIM: 8 days Unlimited Internet 15GB at MAX speed | dtac Happy Tourist SIM: 10 days Unlimited Internet 50GB at MAX speed | dtac Happy Tourist SIM: 15 days Unlimited Internet 30GB at MAX speed | Pay-As-You-Go |
Data | Unlimited 5G internet | Unlimited 5G internet | Unlimited 5G internet | 15GB | 50GB | 30GB | 1GB |
Validity | 8 days | 15 days | 30 days | 8 days | 10 days | 15 days | 1 day |
Price | 449 Baht (~$13) | 699 Baht (~$20.9) | 1199 Baht (~$35.9) | 299 Baht (~$8.9) | 349 Baht (~$10) | 599 Baht (~$17,9) | 49 Baht ($1.5) |
Voice calls | Unlimited calls to all networks in Thailand | Unlimited calls to all networks in Thailand | Unlimited calls to all networks in Thailand | Unlimited dtac calls For international calls via 00400. starting at $1/min | Unlimited dtac calls For international calls via 00400. starting at $1/min | Unlimited dtac calls For international calls via 00400. starting at $1/min | Unlimited dtac calls For international calls via 00400. starting at $1/min |
Bonus | Unlimited dtac Wifi | Unlimited dtac Wifi | Unlimited dtac Wifi | Unlimited chat (Messsenger, WhatsApp, Kakaotalk, Line, WeChat) + 100 baht credit calls all networks in Thailand | Unlimited chat (Messsenger, WhatsApp, Kakaotalk, Line, WeChat) + Free 100 mins calls all network in Thailand + Free 30 mins calling to China, Hong Kong, Macau, Taiwan, India, South Korea and Vietnam | Unlimited chat (Messsenger, WhatsApp, Kakaotalk, Line, WeChat) + 15 baht credit | Unlimited chat (Messsenger, WhatsApp, Kakaotalk, Line, WeChat) |
*Prices updated in September 2024
V. Best DTAC eSIM for Tourists
Discover top most popular DTAC eSIMs for tourists:
*Prices updated in September 2024. Refer the details at https://www.dtac.co.th/en/new-number/esim
1. SIM Kongkrapan
Pay once and enjoy months of smooth communication with unlimited data and free calls, starting at only 147 baht/month.
Kongkrapan SIM 15 Mbps (880 THB ~ $26)
- Validity: 6 months
- 100GB data (15 Mbps) and Unlimited data at 128kbps.
- Free call to DTAC numbers 24 hours (30 mins/call)
- Free call to all networks (60 min/month).
Kongkrapan SIM 15 Mbps (1790 THB ~$53)
- Validity: 12 months
- 100GB data (15 Mbps) and Unlimited data at 128kbps.
- Free call to DTAC numbers 24 hours (30 mins/call)
- Free call to all networks (60 min/month).
Advice: Kongkrapan plans are the best option for those who are on business trips within 3-12 months. However, when registering this SIM card, you need to provide your ID like passport and ID card.
2. Dtac Gaming SIM
Don’t miss it if you’re a real gamer! Surf unlimited data while earning cashback and a game top-up code valued at 4,100 baht.
Gaming SIM 30-day (399 THB)
- Validity: 30 days
- Unlimited data at maximum speed 100 Mbps internet lane.
- 50% cashback bonus for every ‘Pay via dtac’, up to 299 THB/month (billing cut-off every 1st each month).
- Free 50 THB Gaming Nation voucher.
Gaming SIM 12-month (2549 THB)
- Validity: 12 months
- Unlimited data at maximum speed 100 Mbps internet lane.
- 50% cashback bonus for every ‘Pay via dtac’, up to 299 THB/month (billing cut-off every 1st each month).
- Free 50 THB Gaming Nation voucher, up to 12 codes.
Tips: If you’re a big gaming fan, it will be the best-valued option for you.
3. Tourist eSIM
eSIM for short day trips is the best SIM option for tourists. DTAC offers Happy Tourist eSIM with 6 plans as the Tourist SIM cards listed in the Best dtac SIM Card for Tourists (except Pay-as-you-go plan) including:
- dtac Happy Infinite 8 days eSIM Unlimited Internet & Call – 449 Baht (~$13)
- dtac Happy Infinite 15 days eSIM Unlimited Internet & Call – 699 Baht (~$20.9)
- dtac Happy Infinite 30 days eSIM Unlimited Internet & Call – 1199 Baht (~$35.9)
- dtac Happy Tourist eSIM: 8 days Unlimited Internet 15GB at MAX speed – 299 Baht (~$8.9)
- dtac Happy Tourist eSIM: 10 days Unlimited Internet 50GB at MAX speed – 349 Baht (~$10)
- dtac Happy Tourist eSIM: 15 days Unlimited Internet 30GB at MAX speed – 599 Baht (~$17,9)
Tips: Happy Tourist will be the most suitable plan for most travelers. If you are planning to visit Thailand in a few days, it’s highly recommended to choose Happy Tourist eSIM from DTAC.
4. dtac eSIM from Thailandesim.com
Besides dtac eSIM directly from a mobile operator, you can choose local Thailand eSIM providers like thailandesim.com. When buying from us, you can have:
- Various data and validity
- Reasonable prices
- Accessible customer support
- Unlimited data and calls plans are available
Refer some dtac Thailand eSIM plans here:
VI. How Much Does DTAC SIM Cards and eSIM for Tourists Cost?
DTAC offers a variety of SIM cards and eSIM with different pricing and plans to cater to different tourists’ needs. Based on the information in the previous part, here is an overview of the cost of DTAC SIM cards:
- Prepaid SIM cards: DTAC offers prepaid SIM cards with different pricing options, from as low as 49 baht (approximately $1.50) to as high as 1199 baht (approximately $36). These SIM cards come with different data and voice plans, ranging from basic to unlimited. ID documents are needed for this option.
- Postpaid SIM cards: Postpaid SIM cards are better options for those who stay in Thailand for long trips (more than 2 months). The prices of postpaid SIM cards are from 299 baht (approximately $9.50) to 2,499 baht (approximately $80) monthly. Depending on the customer’s needs, these plans come with different data and voice allowances.
- Tourist SIM cards: DTAC also offers tourist SIM cards for visitors to Thailand, with prices ranging from 49 baht (about $1.50) to 1199 baht (about $36). These SIM cards come with different data, voice plans, and value-added services, such as airport pickup and delivery.
- DTAC eSIM: eSIM has more varied prices because the eSIM data plans are often customized with various data and prices by the eSIM providers. The DTAC eSIM prices will be between 299 baht (approximately $9.50) to 1199 baht (approximately $36).
Note: Prices and plans may vary depending on the current promotions and offers from DTAC. Customers can visit DTAC's website or other Thailand eSIM online stores for the latest pricing and plan information.
Check out Thailand eSIM plans with various prices for all tourists!
VII. Where to Buy Thailand DTAC SIM Card and eSIM?
As a traveler to Thailand, you will have many ways to purchase a DTAC eSIM or SIM card to stay connected during the trip.
1. Where to Buy DTAC Tourist SIM Card?
For tourists, DTAC SIM cards can be purchased at various locations in Thailand, including:
- DTAC retail stores: DTAC has over 7,000 retail stores and service centers across Thailand, where customers can purchase DTAC SIM cards and other mobile services. Search the nearest dtac store at https://store.dtac.co.th/en/services/store-locations
- Airports: DTAC SIM cards are also available for purchase at most airports in Thailand, including:
- Suvarnabhumi International Airport (BKK): International Arrival Terminal (Exit gate 7, 9) and International Arrival hall (Baggage Claim No.19, No.10, No.7)
- Chiang Mai International Airport (CEI): International Arrival Terminal, Opposite Exit No.11
- Don Mueang International Airport (DMK): International Arrival hall (between Exit No.3 & No.5 and Opposite Exit 6)
- Phuket International Airport (HKT): Official dtac counter International Arrival Terminal Branch Exit No. 1-2 and Official dtac counter at Baggage Claim No. 2
- Samui Airport (USM): Arrival hall
- Convenience stores: DTAC SIM cards can be found at most convenience stores in Thailand, such as 7-Eleven, Family Mart, BigC and Tesco Lotus Express.
- Online: Customers can purchase DTAC SIM cards through the company’s website or third-party e-commerce platforms, such as Lazada and Shopee.
Notes:
- When purchasing a DTAC SIM card, customers must provide identification, such as a passport or national ID card, to register the SIM card.
- Some promotional SIM cards may have specific activation requirements, such as activating the SIM card within a certain timeframe or using a specific code to activate the SIM card.
2. Where to Buy DTAC eSIM for Tourists?
DTAC eSIMs can be purchased through several channels, including:
- DTAC website: You can purchase a DTAC eSIM through the DTAC website by following the instructions on their eSIM page. Check out on https://www.dtac.co.th/en/prepaid/products/tourist-sim.html
- DTAC stores: DTAC eSIMs are available at DTAC stores. You can find the nearest store by visiting the DTAC website or using their mobile app.
- Online marketplaces: Some online marketplaces in Thailand also sell DTAC eSIMs, such as Lazada or Shopee.
- Airport counters: If you are arriving in Thailand by air, you can register a DTAC eSIM at the DTAC counter at the airport. The dtac kiosks are guided in the previous part.
- eSIM providers: Many eSIM providers offer Thailand DTAC eSIM with many customized options and reasonable prices. You can refer to thailandesim.com, one of the best Thailand eSIM providers, which offers various eSIM plans under DTAC network coverage.
Why you should buy a dtac eSIM on thailandesim.com?
- Various data and validity options
- Reasonable prices with convenient online payment
- 24/7 accessible customer support
VIII. Calls and SMS Rate of DTAC in Thailand
DTAC’s calls and SMS rates are often based on your SIM plans. The rates often are among the following:
Calls | SMS | MMS | Data | Wifi |
1 Baht/Min | 3 Baht/SMS | 5 Baht/MMS | 2 Baht/MB | 1 Baht/Min |
IX. DTAC Roaming Rates
You can check the detailed roaming charges at: https://www.dtac.co.th/en/ir
The service provider would like to adjust service fee rates when roaming in the following destinations:
- Faroe Islands: call receiving rate from 29 Baht/Minute to 38 Baht/Minute
- Indonesia: call receiving rate from 36 Baht/Minute to 38 Baht/Minute
- Japan: call receiving rate from 25 Baht/Minute to 38 Baht/Minute
- Laos: call to Thailand rate from 31 Baht/Minute to 38 Baht/Minute and call receiving rate from 26 Baht/Minute to 38 Baht/Minute
- Malaysia: call receiving rate from 28 Baht/Minute to 38 Baht/Minute
- Myanmar: call to Thailand rate from 30 Baht/Minute to 38 Baht/Minute and call receiving rate from 30 Baht/Minute to 38 Baht/Minute
- Norway: call receiving rate from 27 Baht/Minute to 38 Baht/Minute
- Philippines: call receiving rate from 37 Baht/Minute to 38 Baht/Minute
X. How to Top up Your DTAC SIM
There are several ways to top up your DTAC SIM card in Thailand. Here are some of the most common methods:
- DTAC top-up cards: DTAC top-up cards are available at most retail stores and service centers in Thailand. Customers can scratch off the silver panel on the card to reveal a unique code, which they can enter into their phone to add credit to their DTAC account. To top up your DTAC SIM card, dial *101*VoucherCode#. For example, if your voucher code is 123456789, you would dial *101*123456789#.
- Online top-up: Customers can also top up their DTAC SIM card online through the company’s website or mobile app. This option requires a credit or debit card and allows customers to top up their accounts from anywhere. Check out here: https://www.dtac.co.th/en/serv/quickrefill/index.html
- Mobile banking: Customers can also use mobile banking services offered by their bank to top up their DTAC account. This option requires a registered bank account and may incur additional fees.
- ATMs: Some ATMs in Thailand allow customers to top up their DTAC accounts. Customers can select the DTAC top-up option and enter their phone number to add credit to their account.
- Convenience stores: Many convenience stores in Thailand, such as 7-Eleven and Family Mart, offer top-up services for DTAC SIM cards. Customers can provide their phone number and the amount they wish to top up to the store clerk, who will then add credit to their account.
It’s important to note that some top-up methods may require additional fees or have minimum and maximum top-up amounts. Customers should check with their service provider or the top-up vendor for more information on fees and restrictions.
The following (online) Dtac top-ups are available:
Top-Up | Channels |
20 THB | Online & POS |
30 THB | Online & POS |
50 THB | Online, POS & Voucher |
100 THB | Online, POS & Voucher |
150 THB | POS |
200 THB | Online, POS & Voucher |
250 THB | POS |
300 THB | Online, POS & Voucher |
350 THB | POS |
400 THB | Online & POS |
450 THB | POS |
500 THB | Online, POS & Voucher |
550 THB | POS |
600 THB | POS |
650 THB | POS |
700 THB | POS |
750 THB | POS |
800 THB | Online, POS & Voucher |
850 THB | POS |
900 THB | POS |
950 THB | Online, POS & Voucher |
1000 THB | Online |
1100 THB | POS |
1200 THB | POS |
1300 THB | POS |
1400 THB | POS |
1500 THB | POS |
XI. How to Check DTAC Balance – All DTAC USSD Codes that You Need to Know
Here are the instructions on how to check DTAC balance usage and other USSD codes when using DTAC services:
How to | USSD codes |
Check your remaining balance | *101*9#📞 or *101📞 |
Check your add on credit | *101*1*9#📞 |
Check your Internet credit | *101*4*9#📞 |
Check your SMS credit | *101*2*9#📞 |
Check your Happy for free credit | *101*5*9#📞 |
Find out your phone number | *102*9#📞 |
Check your Promotion | *103*8*9#📞 |
Switch plans IVR | *1003📞 press 9 |
Current and last month’s usage | *108*9#📞 |
Emergency refill service | *110*9#📞 |
Wrong number Refund service | *111*9#📞 |
Emergency Call Me Back service | *114*number_you_want_to_contact*9#📞 or IVR:*1490 |
Turn on IR (International Roaming) | *118*9#📞 |
Turn off IR | *118*2*9#📞 |
Check IR roaming status | *118*3*9#📞 |
Check the price of a call to any country | 004 international_number_to_call 📞 |
Credit Transfer Service | *112*10 digits Happy Number*amount*9#📞 or IVR: *1411 |
Live Thai to English translation service | IVR: *1021 press 9📞 |
Check remaining balance of your internet package | *101*4*9#📞 |
Check if the number is in DTAC network | *102*1*08XXXXXXXX*9#📞 |
Activate/Deactivate Happy internet | *104*71*9#📞 or (Activate) *104*72*9# 📞 |
Use credit topup code | *100*card number,refill code*9#📞 |
XII. DTAC vs Other Thailand Mobile Operators
Based on the November 2023 Opensignal report, DTAC comes in second place behind AIS in several key mobile network experience categories for Thailand:
- 5G Availability: AIS dominates, but DTAC doesn’t fare badly.
- Download Speed Experience: AIS takes the crown, with DTAC likely trailing behind.
- Upload Speed Experience: AIS boasts the lead, with DTAC likely offering slower upload speeds.
However, DTAC does snag a win for:
- Video Experience: DTAC provides the best video streaming experience, meaning you might experience fewer buffering interruptions and higher quality video with DTAC.
Compared to other mobile operators, dtac is a good option for tourists due to its stable connection and coverage. For those who need a varied data & validity options and a reasonable price, dtac SIM eSIM or SIM card is an optimal option.
XIII. DTAC SIM Card Alternatives for Tourists
In addition to DTAC SIM cards, other SIM card alternatives are available for tourists visiting Thailand. Here are some popular options:
- AIS SIM Card: AIS (Advanced Info Service) is another popular mobile operator in Thailand, offering tourists a range of SIM card options. Their SIM cards can be purchased at airports, convenience stores, and online, and they offer a variety of data plans to suit different needs and budgets. Find out more information on AIS SIM card guides for tourists.
- TrueMove H SIM Card: Although TrueMove has merged with dtac to become True Corporation, TrueMoveH still offers specific SIM card plans for tourists, with options for prepaid and postpaid plans. Their SIM cards can be purchased at airports, convenience stores, and online, and they offer a range of data plans to suit different needs. Read more about TrueMove H mobile operator.
- 7-Eleven SIM Card: Convenience store chain 7-Eleven offers its own SIM card for tourists visiting Thailand. The SIM card can be purchased at any 7-Eleven store and offers various data plans, with the option to top up credit in-store or online.
Notes:
- Different SIM card providers may offer different coverage and network quality, so it's worth researching and comparing different options before deciding.
- Some providers may require proof of identification to purchase a SIM card, so be sure to bring a valid ID when shopping for a SIM card in Thailand.
While DTAC SIM cards are a popular option for tourists visiting Thailand, dtac Thailand eSIM is one of the best alternatives. Here are some reasons why eSIMs can be a great alternative for tourists in Thailand:
- Convenience: With an eSIM, no need to insert physical SIM cards, you can install and activate the Thailand eSIM right before departure and start using it right after landing.
- Flexibility: Unlike traditional SIM cards tied to a specific carrier or plan, eSIM will provide you with many data and validity options that will be suitable for any trip in Thailand.
- Easier support: For eSIM, you will not need to bring your device or your SIM card to the store for support. You can request online support with only the order ID or email.
- Multi-countries plans available: Many travelers choose to travel across Thailand and other regional countries in one trip. So multi-countries eSIM plans will be the best options.
Refer to some multi-countries eSIM plans on thailandesim.com:
Note:
Not all devices are compatible with eSIMs, so it's important to check with your device manufacturer or service provider before purchasing an eSIM. Check out the updated eSIM compatible device list.
XIV. Final Words
In conclusion, this article is a comprehensive guide to DTAC SIM cards and eSIMs for tourists in Thailand. It covers everything you need to know, from the different types of SIM cards and their prices to how to purchase a SIM card, top it up, and check your balance. The article also provides information about DTAC’s coverage and roaming services, and it compares DTAC to other mobile operators in Thailand. Get a dtac SIM card and be ready for your trip!
XV. FAQs
What is dtac in Thailand?
DTAC – “Total Access Communication Public Company Limited”, a mobile operator in Thailand. They offer various services including mobile internet for tourists.
Is dtac good in Thailand?
Yes. dtac is one of the top mobile operators in Thailand, so you can be assured about their services.
Which dtac SIM card is best for tourists in Thailand?
dtac offers various tourist SIM cards like dtac Happy Tourist SIM, and dtac Happy Tourist Infinite SIM. You can refer to more details in the article or on their official website.
Where can I purchase a DTAC SIM card?
DTAC SIM cards can be purchased at convenience stores, airports, and DTAC stores.
Can I extend the validity of my DTAC SIM card?
Yes, you can extend the validity of your DTAC SIM card by topping up with a certain amount of credit.
Does dtac have eSIM plans?
Yes. You can buy dtac eSIM plans from mobile operators and many other Thailand eSIM providers like thailandesim.com
Can I buy a dtac SIM card at Bangkok airport?
Yes. Here’s the detailed locations for buying dtac SIM cards at Bangkok Airport:
Branch 1 : International Arrival Terminal, Exit Gate 7
Branch 2 : International Arrival Terminal, Exit Gate 9
Branch 3 : International Arrival hall, Baggage Claim No. 19
Branch 4 : International Arrival hall, Baggage Claim No. 10
Branch 5 : International Arrival hall , Baggage Claim No. 7
Is DTAC coverage good?
Yes. As a leading mobile operator in Thailand, you can be assured about the dtac network coverage across Thailand.
Is DTAC or AIS better for tourists?
Both of them offer good mobile plans for tourists. For those who need a stable and high speed connection, AIS is better. For those who need various data and validity options with reasonable prices, dtac is a better option.
How to top up dtac SIM?
You can use dtac app or go to https://www.dtac.co.th/en/serv/quickrefill/index.html to top up your number.