Best SIM Plans in Thailand 2026: 4 Carriers, 18 Plans Compared

TL;DR: Top 3 Picks for Thailand

Compare All 18 Thai Plans on SimFinder →

Below, we break down the entire market using real plan data.

Table of Contents

• The Thai Mobile Landscape
• Price Breakdown: What Every Carrier Charges
• Best Value Plans by Use Case
• 5G and eSIM: What’s Available
• Frequently Asked Questions
• Key Takeaways

Thailand’s mobile market is built on three MNO networks — AIS, TrueMove H, and DTAC — plus one budget MVNO, Penguin SIM, that resells AIS capacity at lower prices.

SimFinder’s database tracks 4 carriers and 18 plans in Thailand. Every plan is contract-free with zero cancellation fees. Prices range from ฿199/month ($5.50 USD) to ฿1,499/month ($41.50 USD), making Thailand one of the most affordable mobile markets in Southeast Asia.

This guide breaks down the entire Thai SIM market using actual plan data, network quality scores, and pricing analysis.

The Thai Mobile Landscape: Who Owns What

Thailand has three physical networks operated by three MNOs, plus one MVNO.

Quality data: OpenSignal 2025, measured June 2025

AIS is the clear network leader. With a coverage score of 95/100 and the fastest download speeds at 98.4 Mbps, AIS dominates across every quality metric. Its 20ms latency is the lowest among the three MNOs. This matters most outside of Bangkok — on the islands, in northern Thailand, and along intercity highways, AIS maintains the most consistent signal.

TrueMove H holds second place at 93/100 coverage and 87.3 Mbps download speeds. It is strong in Bangkok and major tourist areas like Phuket and Chiang Mai.

DTAC is the third network at 91/100 coverage and 81.6 Mbps. The gap between DTAC and the other two is narrower than in many other markets — all three Thai networks provide solid urban coverage.

The True-DTAC merger context: True Corporation and DTAC merged in March 2023. Despite the corporate merger, TrueMove H and DTAC continue to operate as separate consumer brands with independent plan lineups and pricing. For SIM buyers, they remain effectively two different carriers.

Penguin SIM is the only MVNO in the Thai market tracked by SimFinder. It runs on AIS’s network and offers the lowest-priced plans, but without 5G or eSIM support.

Price Breakdown: What Every Carrier Charges

All 18 plans are contract-free with no cancellation fees. The key variables are price, data, voice inclusions, 5G access, and eSIM support.

Prepaid Plans (No Contract)

5G Postpaid-Style Plans (No Contract)

Price per GB Analysis

When sorted by price per gigabyte, the value leaders become clear:

The TrueMove H Prepaid 60GB plan at ฿300/month is a significant outlier — at ฿5.00 per GB, it delivers more than 3x the value of the next closest plan. This is the standout deal in the Thai market.

Compare All 18 Thai Plans on SimFinder →

Best Value Plans by Use Case

Budget / Light Use (Under ฿300/month)

Penguin SIM ฿199 6GB — The absolute cheapest plan in Thailand. Runs on AIS’s network (95/100 coverage), includes unlimited voice calls, and costs roughly $5.50 USD per month. No 5G or eSIM, but for travelers who mainly use WiFi or anyone wanting a minimal mobile plan, the price is hard to argue with.

DTAC Prepaid ฿299 15GB — For ฿100 more than Penguin’s 6GB, DTAC gives you 15GB with unlimited calls. No 5G or eSIM at this tier, but 15GB is enough for daily social media, messaging, and maps.

Most People (฿300–฿500/month)

TrueMove H Prepaid ฿300 60GB — This is the plan that breaks the market’s pricing logic. At ฿300 for 60GB with unlimited calls, it delivers ฿5.00/GB — the best data value in all of Thailand by a wide margin. The trade-off: no 5G and no eSIM. If you can live without those two features, nothing else comes close on pure value.

TrueMove H 5G Super Max ฿499 40GB — If you need 5G and eSIM, this is the entry point. 40GB of 5G data on TrueMove H’s network (87.3 Mbps, 93/100 coverage), eSIM support for instant activation, and 250 voice minutes. DTAC offers a near-identical plan at the same price.

Digital Nomads / Heavy Data Users

AIS Prepaid ฿899 50GB — For remote workers who need the most reliable connection, AIS’s network quality justifies the premium. 50GB of 5G data, eSIM support, unlimited calls, and 95/100 coverage with the lowest latency (20ms) in the country. At ฿899 ($25 USD), this is still remarkably affordable by global standards.

DTAC 5G Super Max ฿899 80GB — If raw data volume matters more than network ranking, DTAC delivers 80GB for the same ฿899 that AIS charges for 50GB. DTAC’s 91/100 coverage is solid in urban areas where most digital nomads work.

Maximum Speed / Unlimited Data

TrueMove H 5G Unlimited ฿1,499 and DTAC 5G Unlimited ฿1,499 — Both carriers offer unlimited 5G data at the same ฿1,499 price point (~$41.50 USD) with 650 voice minutes and eSIM support. Between the two, TrueMove H edges ahead on network quality (84/100 vs 82/100 overall). For heavy streamers, hotspot users, or anyone who simply does not want to think about data limits, these are the top-tier options.

Compare Thai SIM Plans by Your Needs →

5G and eSIM: What’s Available

5G Coverage

12 of 18 plans (67%) include 5G access. All three MNOs offer 5G, but availability depends on the plan tier:

Thailand’s 5G network is concentrated in Bangkok, Chiang Mai, Phuket, and other major urban centers. If you spend most of your time in cities, 5G delivers noticeably faster speeds. Outside urban areas, you will fall back to 4G on all carriers.

eSIM Support

11 of 18 plans (61%) support eSIM. This is lower than some developed markets but improving:

If eSIM is a priority — for example, if you want to activate a Thai SIM before arriving — your best options are AIS Prepaid 10GB+ (฿599+), TrueMove H 5G plans (฿499+), or DTAC 5G plans (฿499+).

Compare Plans on SimFinder

The data in this guide comes from SimFinder’s database, which tracks 18 Thai plans across 4 carriers. If you want to filter by price, data, 5G, or eSIM, use the comparison tool to find your best match.

Compare Thai SIM Plans →

Frequently Asked Questions

What is the cheapest SIM plan in Thailand?

Penguin SIM’s 6GB plan at ฿199/month (~$5.50 USD) is the cheapest option in SimFinder’s database. It runs on AIS’s network with unlimited voice calls. If you need more data, DTAC Prepaid 15GB and AIS Prepaid 1GB both cost ฿299.

Which Thai carrier has the best coverage?

AIS leads with a coverage score of 95/100, followed by TrueMove H at 93/100 and DTAC at 91/100 (OpenSignal June 2025). For travel outside Bangkok and major tourist areas, AIS is the most reliable choice.

Can I get an eSIM in Thailand?

Yes. AIS offers eSIM on its 10GB and above prepaid plans. TrueMove H and DTAC support eSIM on all their 5G postpaid plans. However, prepaid plans from TrueMove H, DTAC (except the 30GB plan which has 5G but no eSIM), and Penguin SIM do not include eSIM. 11 of 18 plans (61%) in our database support eSIM.

Is 5G widely available in Thailand?

5G is available on 12 of 18 plans (67%) in SimFinder’s database. All three MNOs — AIS, TrueMove H, and DTAC — offer 5G on their mid-range and premium plans. 5G coverage is concentrated in Bangkok and major cities. The cheapest 5G plan is DTAC Prepaid 30GB at ฿499.

What’s the best SIM for a tourist visiting Thailand?

TrueMove H Prepaid 60GB at ฿300/month (~$8.30 USD) is an outstanding deal — 60GB of data with unlimited calls and no contract. For short stays in cities, Penguin SIM 6GB at ฿199 works for basic needs. If you need 5G and eSIM, AIS Prepaid 10GB at ฿599 lets you activate before you land.

Do I need a contract for a Thai SIM card?

No. All 18 plans tracked by SimFinder are contract-free (0-month contracts) with zero cancellation fees. You can switch carriers or cancel at any time without penalty.

What happened with the True-DTAC merger?

True Corporation and DTAC completed their merger in March 2023, forming True Corporation Plc. However, the TrueMove H and DTAC brands continue to operate with separate plan lineups, pricing, and SIM products. Both networks remain functionally independent for consumers.

Key Takeaways

The Thai SIM market in 2026:

• 4 carriers, 18 plans, all contract-free with zero cancellation fees
• Three MNO networks: AIS (coverage king, 95/100), TrueMove H (strong mid-range, 93/100), DTAC (competitive, 91/100), plus Penguin SIM as the lone budget MVNO on AIS
• Price range: ฿199/mo (Penguin 6GB, ~$5.50) to ฿1,499/mo (Unlimited 5G, ~$41.50) — among the cheapest mobile markets globally
• Best value: TrueMove H Prepaid 60GB at ฿300 delivers ฿5.00/GB — 3x better than any other plan
• 5G on 67% of plans, eSIM on 61% — available from all three MNOs but not on entry-level tiers
• No data rollover on any plan in the Thai market — use it or lose it each month

For most users, the decision comes down to priorities: choose TrueMove H Prepaid 60GB for raw value, AIS for the best network quality, or Penguin SIM for the lowest possible price.

Find Your Best Thai SIM Plan →

Plan data is current as of March 2026. Prices include 7% VAT (tax-inclusive). Check carrier websites for the latest information.

Compare all plans side by side using SimFinder’s comparison tool.