eSIM-Now.com
English
עברית
Deutsch
Français
Dansk
Español
Bahasa Indonesia
Thailand's Mobile Networks — What Travelers Need to Know
Thailand's mobile market is a duopoly. Two carriers — AIS and True Corp — control over 95% of the market. When you buy a travel eSIM for Thailand, it connects to one or both of these networks. A third operator, NT (National Telecom), is state-owned and not used by travel eSIM providers.
The 2023 merger of DTAC and TrueMove H into True Corp means references to "DTAC" or "TrueMove" now point to the same company.
The Two Networks Compared
| AIS | True Corp (formerly DTAC + TrueMove) | |
|---|---|---|
| Subscribers | ~46.5 million | ~50 million |
| Market share | ~44-46% | ~38-40% |
| 4G population coverage | ~98% | ~97% |
| 5G base stations | ~8,000+ | ~6,000+ |
| Median download speed | 45-55 Mbps | 35-45 Mbps |
| 5G download speed | 150-250 Mbps | 120-200 Mbps |
| Best for | Rural, islands, overall speed | Cities, competitive in urban areas |
| Used by travel eSIMs? | Yes | Yes |
Sources: Opensignal Thailand Report (2024), Ookla Speedtest Global Index Q4 2024, carrier investor reports.
AIS — Best Overall Coverage
AIS is Thailand's largest carrier and the better choice for travelers going beyond Bangkok. It has more rural cell sites, stronger island coverage, and consistently wins speed tests. AIS leads in both 4G availability and 5G deployment.
Best for: Island hopping, northern Thailand (Chiang Mai, Pai, Mae Hong Son), national parks, and any travel outside major cities.
True Corp — Strong in Cities
True Corp (the merged DTAC + TrueMove H) is competitive in Bangkok and major tourist cities. Post-merger, their combined spectrum is improving rural performance, but AIS still leads outside urban areas.
Best for: Trips focused on Bangkok, Pattaya, and major resort areas.
Which Network Does Each eSIM Provider Use in Thailand?
| Provider | Network(s) in Thailand | Notes |
|---|---|---|
| eSIM-Now | AIS, True Corp | Connects to multiple Thai carriers |
| Airalo | Primarily True Corp; some plans via AIS | Check the "supported networks" listing per plan |
| Holafly | True Corp | Unlimited data plans on True Corp network |
| Saily | AIS | Routes through Thailand's largest carrier |
| Nomad | True Corp | Most plans connect to True Corp |
Network assignments based on provider disclosures and user testing as of April 2026. Carriers may change without notice.
Key takeaway: If you're visiting Thai islands or rural northern Thailand, choose a provider that connects to AIS — it has measurably better coverage outside cities. eSIM-Now connects to both networks.
Coverage by Region
Major Cities — Both Networks Excellent
| City | 4G | 5G | Speed | Notes |
|---|---|---|---|---|
| Bangkok | Excellent | Widespread | 50-150 Mbps | 5G along BTS/MRT corridors, Sukhumvit, Silom |
| Chiang Mai | Excellent | City center | 30-100 Mbps | Mountains north/west are weaker |
| Phuket | Excellent | Patong, Phuket Town | 30-80 Mbps | Full island coverage |
| Pattaya | Excellent | Available | 50-100 Mbps | No issues |
| Krabi / Ao Nang | Very Good | Limited | 20-60 Mbps | Railay weaker due to cliffs |
In major cities and resort areas, both AIS and True Corp perform well. Your eSIM provider choice won't matter much for urban-only trips.
Islands
| Island | Coverage | Carrier Matters? | Notes |
|---|---|---|---|
| Phuket | Excellent | No | Full 4G/5G island-wide |
| Koh Samui | Good 4G | Slightly | AIS better on south coast |
| Koh Phangan | Good in towns | Yes | AIS notably better in interior and northern beaches |
| Koh Tao | Good in main areas | Slightly | Dive sites and remote beaches may lose signal |
| Phi Phi Islands | Good but congested | No | Both carriers present; speeds drop during peak season |
| Koh Lanta | Good | Slightly | AIS stronger in less-developed south |
| Koh Lipe | Moderate | Yes | Coverage exists but can be 3G-only; AIS better |
| Koh Chang | Good | Slightly | Interior hills weaker |
| Koh Kood | Moderate | Yes | AIS better, interior has gaps |
For island trips: Download offline Google Maps before leaving the mainland. Most inhabited islands have 4G in towns, but interiors and remote beaches can be patchy.
Rural & Remote Areas
| Area | Coverage | Recommended Carrier | Notes |
|---|---|---|---|
| Pai / Mae Hong Son | Moderate | AIS | Town centers covered, mountain roads spotty |
| Doi Inthanon | Moderate | AIS | Main roads covered, trails variable |
| Khao Sok National Park | Limited | AIS | Deep jungle has no signal |
| Northern hill tribes | Limited to none | AIS | Some villages have basic coverage |
| Kaeng Krachan | Limited | AIS | Park interior largely uncovered |
| Thai-Myanmar border areas | Variable | AIS | Some weak spots along border |
If your itinerary includes rural Thailand or islands: Make sure your eSIM connects to AIS. Download offline maps and translation packs before heading out.
Does 5G Matter for Travelers in Thailand?
Not really. Here's why:
- Thailand's 4G speeds (30-55 Mbps) easily handle maps, Grab, social media, and video calls
- 5G is concentrated in Bangkok city center and a few provincial capitals
- Most travel eSIM plans connect via 4G by default
- 5G drains battery faster — a concern when you're out exploring all day
5G is a bonus if you're in central Bangkok, but don't choose a provider based on 5G alone.
Frequently Asked Questions
Does eSIM work in Thailand? Yes. Thailand has excellent eSIM support with 4G coverage reaching 97-98% of the population. Both major carriers (AIS and True Corp) support eSIM connections. All tourist areas are well covered.
Which network does Airalo use in Thailand? Airalo's Thailand plans primarily connect to True Corp (formerly DTAC/TrueMove H). Some plans route through AIS. Check the "supported networks" field on the specific plan you're purchasing.
Which network does Holafly use in Thailand? Holafly connects to True Corp's network for its unlimited data plans in Thailand.
Does my eSIM work on Thai islands? Yes — all major tourist islands (Phuket, Koh Samui, Koh Phangan, Koh Tao, Phi Phi) have 4G coverage in populated areas. Smaller or more remote islands (Koh Lipe, Koh Kood) may have slower or patchier coverage, especially in interiors.
Is there coverage in Khao Sok National Park? Limited. Cell towers cover the park entrance and floating bungalow areas on Cheow Lan Lake, but deep jungle trails have no signal. Download offline maps before entering.
Will my eSIM work for Grab? Yes. Grab is essential in Thailand (especially Bangkok) and works perfectly over your eSIM data connection. Budget about 50MB/day for ride-hailing.
Is AIS or True Corp better for tourists? AIS has better coverage in rural areas, islands, and northern Thailand. True Corp is competitive in cities. For urban-only trips, both are equal. For mixed itineraries, AIS has the edge.
Check Official Coverage Maps
- AIS — ais.th/coverage (English available)
- True Corp — true.th/coverage (Thai, use browser translate)
- GSMA Coverage Map — gsma.com/coverage (English, all carriers)
Get Connected Before You Land
eSIM-Now connects to both AIS and True Corp — Thailand's only two major carriers — giving you the best available coverage from Bangkok to the islands. Plans start at $3.17 for 1GB over 30 days. See our Best eSIM for Thailand guide for full price comparisons.
Purchase your eSIM before departure, install the QR code at home, and you'll have data the moment you land at Suvarnabhumi or Don Mueang.
eSIM-Now.com