Staying connected in Koh Samui with a local SIM card is one of the wisest options for Koh Samui visitors. In this guide, we’ll share insider tips from locals on how to buy a SIM card in Koh Samui: where to find the best prices, which plans to choose, so you can focus on enjoying the island without worrying about connectivity!

SIM card in Koh Samui

I. Koh Samui SIM Cards for Tourists

1. Types of Thailand SIM cards in Koh Samui

There are several types of Koh Samui SIM cards for visitors to consider:

  • Prepaid local SIM card – best options for local people or long-term visitors in Thailand. These SIM cards come with cheap voice and data packages offered by popular local mobile operators – AIS, dtac & TrueMove H.
  • Tourists’ Prepaid SIM card – specially designed for Thailand visitors, such as Koh Samui visitors, this type of SIM typically offers unlimited data, free international calls, or extra benefits tailored to fit any visitor’s needs.
  • Data-only SIM card: Perfect for short-term travelers who only need internet access, this type of SIM is ideal for those exploring Koh Samui and do not need voice or messaging services.
physical SIM card
physical SIM card

2. Which I need to buy a Tourist SIM card in Koh Samui??

For buying a local SIM card in Koh Samui, visitors need to bring:

  • Make sure your phone is not unlocked, and can work freely in Thailand.
  • Proof of ID (ID card/Passport)
  • Cash if available.

3. Tourist Koh Samui SIM card prices range 

In Koh Samui (and across Thailand), major providers offer prepaid tourist SIMs with unlimited 5G/4G data, free local and some international calls, plus added perks like Wi‑Fi access and bonus credit. The pricing (as of mid‑2025) is:

SIM card planData & BenefitsValidityPrice (USD)
AIS Lucky Tourist SIM – 5‑DayUnlimited 5G/4G data, free AIS calls, ฿100 bonus credit, unlimited AIS Wi‑Fi5 days$9.97 (ais.th)
AIS Lucky Tourist SIM – 8‑Day Unlimited 5G/4G data, free AIS calls, ฿100 bonus credit, unlimited AIS Wi‑Fi8 days$12.83
AIS Lucky Tourist SIM – 15‑Day Unlimited 5G/4G data, free AIS calls, ฿100 bonus credit, unlimited AIS Wi‑Fi15 days$19.97
AIS Lucky Tourist SIM – 30‑DayUnlimited 5G/4G data, free AIS calls, ฿100 bonus credit, unlimited AIS Wi‑Fi30 days$34.25
True dtac Tourist Infinite SIM – 8‑DayUnlimited 5G/4G data, unlimited Wi‑Fi, free local calls (up to 15 min/call)8 days$12.83
True dtac Tourist Infinite SIM – 15‑DayUnlimited 5G/4G data, unlimited Wi‑Fi, free local calls (up to 15 min/call)15 days$19.97
True dtac Tourist Infinite SIM – 30‑DayUnlimited 5G/4G data, unlimited Wi‑Fi, free local calls (up to 15 min/call)30 days$34.25
True “Thailand Tourist Infinite SIM” – 10‑DayUnlimited 5G/4G data, unlimited Wi‑Fi, free local calls (24/7)10 days$9.97

✨ The price may change depending on the provider. Check the most accurate information on the provider’s website before purchasing.

II. Where to buy a Thailand SIM Card/eSIM for Koh Samui

Thailand SIM cards can be found & bought easily online, at the airports, or in physical stores. Consider our recommendations below:

  • Thailand International Airport: Telecom shops at the airport offer prepaid SIM cards for tourists.

✨ Get more insight on Getting a SIM Card & eSIM at Thailand Airports/Border Gates by Province

  • Convenience stores: 7-Eleven is widely available throughout the city and also sells tourist SIM cards.
  • Official mobile network operator stores: You can visit the local stores of mobile network operators like AIS, True Move H, & dtac to purchase a SIM card.
You can purchase a tourist SIM card at mobile operators' kiosk at the airport
You can purchase a tourist SIM card at mobile operators’ kiosk at the airport

III. Koh Samui eSIM for travelers – a smart alternative

Koh Samui visitors used to use physical SIM cards to connect to the internet. However, Koh Samui eSIM has changed internet access with its convenience, flexibility, and user-friendly setup. For a fast and reliable connection, visitors should consider using Koh Samui eSIM to save time and inconvenience.

Thailandesim.com offers diverse eSIM plans for Koh Samui might be your data solution:

  • It can be purchased online and installed before arriving in Thailand, eliminating the need to queue at the airport to buy a SIM.
  • No passport is required for registration.
  • It provides many plans for visitors to choose from.
  • Supports 5G network.

Plans that may interest you

eSIM Koh Samui 8 days plan
eSIM Koh Samui 8 days plan
$12.90
eSIM Koh Samui 10 days plan
eSIM Koh Samui 10 days plan
$12.90
eSIM Koh Samui 15 days plan
eSIM Koh Samui 15 days plan
$19.90

IV. Tips and Recommendations to buy a Koh Samui SIM card

Here are some helpful tips and recommendations to ensure you choose the best SIM card or eSIM for your stay:

  • Compare Providers and Plans: AIS, TrueMove H, and dtac all offer reliable tourist SIM packages with unlimited data and bonus features. Check their websites or visit local shops to compare deals before purchasing.
  • Passport Required: Thailand requires passport registration for all SIM purchases, so have your ID ready.
  • Consider eSIM Options: If your phone supports eSIM, it’s a convenient, paperless choice. Providers like AIS and dtac now offer tourist eSIMs that can be activated instantly.
  • Look for Unlimited Data Plans: Most tourist SIMs include unlimited 4G/5G data, which is perfect for navigation, social media, and staying in touch.
  • Check Validity Periods: Match the plan to your stay duration — 5–8 days, 15 days, or 30 days — to get the best value.
  • Ask About Top-Up Options: For longer stays, ensure your plan can be easily topped up at 7-Eleven or FamilyMart.
  • Buy from Reputable Sellers: Stick to official carrier stores, large convenience chains, or licensed shops to avoid counterfeit or expired SIMs.
  • Stay Safe with a Backup: Keep a digital copy of your SIM/eSIM details and customer service contacts handy in case of loss or activation issues.

V. FAQs

Where can I buy a SIM card in Koh Samui?

You can find SIM cards at:
Official mobile shops: AIS, dtac, & TrueMove H
Convenience stores: 7-Eleven, Family Mart
Airport kiosks
Buying eSIM via thailandesim.com instead of using physical SIMs

Which provider is the best in Koh Samui?

All three main providers—AIS, TrueMove H, and dtac—offer reliable coverage in most tourist areas. AIS is often praised for its extensive 4G/5G network on the island, but TrueMove H and dtac also have solid coverage.

Do I need to show my ID to buy a SIM card?

Yes, Thai law requires you to register your SIM card using a valid passport. Be prepared to show it at the time of purchase

Will my phone work with Thai SIM cards?

Your phone must be unlocked to use a Thai SIM card. Most modern smartphones are compatible with Thai networks, which use standard GSM technology.

Can I use eSIM instead of a SIM card?

Yes, visitors can use eSIM to stay connected in Koh Samui. Consider using eSIM from thailandesim.com for a cheap price and diverse eSIM plans.

VI. Conclusion

Buying a SIM card in Koh Samui is easy and affordable, with tourist SIMs costing $10–34 USD for unlimited data, depending on your stay. AIS, TrueMove H, and dtac offer reliable coverage. Remember to buy from reputable shops, bring your passport for registration, and consider an eSIM if your phone supports it. Enjoy seamless connectivity during your island adventures!