Best SIM Cards to Use in Chiang Mai, Phuket, Pattaya, and Bangkok (All expa

Finding the best SIM card in Thailand for an expat depends on several factors, including where you live, your budget, and how you plan to use your phone. While tourist SIMs are popular, expats living long-term in cities like Chiang Mai, Phuket, Pattaya, and Bangkok will find that local prepaid or postpaid plans offer much better value.

Here's a comprehensive guide to help you choose the best SIM card, focusing on the three major mobile networks in Thailand: AIS, DTAC, and TrueMove H.

The Big Three: A Quick Overview

Thailand's mobile network market is dominated by three main providers, all of which offer a variety of plans for foreigners.

• AIS (Advanced Info Service): Widely regarded as having the most extensive and fastest 5G network coverage, particularly in major cities and tourist areas. It's often the preferred choice for those who want the most reliable connection, though plans can sometimes be slightly more expensive.

• DTAC (Total Access Communication): Known for its competitive pricing and solid coverage, especially in urban areas. DTAC is a popular choice for budget-conscious users and often offers special packages tailored to foreign workers.

• TrueMove H: A strong competitor with good network speeds and a wide range of packages, including unlimited data plans. TrueMove H and DTAC merged in 2023, and they are in the process of integrating their networks, which will further improve their coverage and reliability.

Prepaid vs. Postpaid: What's the Difference for Expats?

Choosing between a prepaid and a postpaid plan is a key decision for expats.

• Prepaid SIM Card (Pay-as-you-go):

  • Pros: Easy to get and activate (just need your passport). No long-term contract or monthly bill. You have full control over your spending.

  • Cons: You need to remember to top up your balance and buy a new data package each month.

  • Best for: Most expats, especially those without a work permit, as prepaid plans are straightforward and flexible.

• Postpaid SIM Card (Monthly Contract):

  • Pros: Convenient with a single monthly bill. Often includes more data and perks.

  • Cons: Requires a long-term contract (typically 12 months) and often requires a work permit and a Thai bank account for setup.

  • Best for: Long-term expats with a work permit who want a hassle-free monthly plan.

Network Coverage in Major Expat Cities

While all three providers offer strong service in urban areas, there are some minor differences in coverage.

• Bangkok: All three providers have excellent 5G coverage throughout the city. You will not have any issues with speed or connectivity.

• Chiang Mai: All three have strong coverage in the city and surrounding areas. AIS is often cited as having a slight edge for network stability in the more rural or mountainous regions outside the city center.

• Phuket & Pattaya: Given their status as major tourist and expat hubs, all networks provide excellent service in these areas. Coverage is reliable in the main towns, on the beaches, and in surrounding neighborhoods.

How to Get a SIM Card as an Expat

1. Bring Your Passport: By law, you must present your passport to register and activate any SIM card.

2. Choose a Plan: You can find the best deals at official stores in shopping malls, at the airport, or even at convenience stores like 7-Eleven.

3. Local vs. Tourist SIM: While tourist SIMs are easy to buy at the airport, local prepaid plans are generally much cheaper and can be extended indefinitely with top-ups. Simply ask for a "prepaid SIM card" and not a "tourist SIM."

The best SIM card for you ultimately depends on your personal needs. For most expats, a prepaid SIM card from AIS, DTAC, or TrueMove H offers the perfect balance of flexibility, cost, and excellent network coverage in all of Thailand's major expat cities.