Thailand is one of Asia's most popular travel destinations — and one where your choice of eSIM network genuinely makes a difference once you leave Bangkok. On Koh Tao, in northern Pai, on the Similan Islands, the gap between AIS and its competitors is significant. Here is the complete honest comparison for 2026.
Thailand's Three Networks — Quick Verdict
| Network | Coverage | 5G Cities | Rural Thailand | Tourist Verdict |
|---|---|---|---|---|
| AIS | ~43% market share | ✅ Best 5G | ✅ Best islands + mountains | 🏆 Best for all Thailand |
| True Move H | ~32% market share | ✅ Strong 5G | ⚠️ Drops in hills | Good for Bangkok + main resorts |
| DTAC (True) | Merged 2023 | ✅ Good | ⚠️ Limited outer islands | Not recommended as first choice |
Our Thailand eSIM connects to AIS — Thailand's largest and most geographically extensive network.
Coverage by Destination
🏙️ Bangkok
- Sukhumvit / Silom: AIS 5G 80–250 Mbps. Outstanding.
- BTS Skytrain + MRT: AIS and True Move both maintain signal throughout elevated stations. AIS stronger underground.
- Chatuchak Weekend Market: Dense crowds — AIS handles congestion better during peak Saturday hours.
- Suvarnabhumi Airport (BKK): AIS 5G excellent throughout all terminals.
🏖️ Phuket
- Patong / Bangla Road: AIS 5G 60–150 Mbps. Excellent even at peak nighttime crowds.
- Kata and Karon Beaches: AIS excellent. True Move good.
- Promthep Cape (southernmost tip): AIS 4G good at viewpoint.
🏝️ Koh Samui, Koh Phangan, Koh Tao
- Koh Samui: AIS excellent throughout. True Move good at Chaweng/Lamai, drops interior.
- Koh Phangan (Full Moon Party — Hat Rin Beach): AIS best. Download everything before arriving during Full Moon.
- Koh Tao (Dive Island): AIS standout choice. True Move limited outside Mae Haad. Remote east coast (Tanote, Ao Leuk): AIS only.
🌿 Chiang Mai and Northern Thailand
- Chiang Mai city: AIS 5G 60–180 Mbps.
- Doi Suthep (sacred mountain, 1,073m): AIS 4G to temple. True Move drops above 800m.
- Pai (mountain town, 762-curve road): AIS covers Pai town. True Move limited. Mountain road: AIS partial, True Move drops frequently. Offline navigation essential.
Island Day Trip Coverage
| Location | AIS Signal | Practical Note |
|---|---|---|
| Phi Phi Don (town) | ✅ 4G good | Upload at pier before boat back |
| Phi Phi Leh (Maya Bay) | ❌ None | Limestone bay — no towers |
| Similan Islands | ❌ Very limited | 87km offshore — no reliable signal |
Thailand eSIM Plans — Exact Prices
| Plan | Data | Validity | Price | Best For |
|---|---|---|---|---|
| Starter | 1GB | 7 days | $7.99 | Very short trip |
| Standard | 3GB | 30 days | $6.99 | 5-7 days Bangkok |
| Traveller | 5GB | 30 days | $9.99 | 10 days Bangkok + island |
| Explorer | 10GB | 30 days | $15.99 | 2 weeks full Thailand |
| Nomad | Daily 3GB | 7 days | $25.99 | Heavy streaming / work |
Frequently Asked Questions
Which network does your Thailand eSIM use?
Our Thailand eSIM connects to AIS — Thailand's largest network with the best coverage on islands and in northern mountains. Essential if you're going beyond Bangkok.
Does WhatsApp work normally in Thailand?
Yes. Thailand has no internet restrictions. WhatsApp, Instagram, Facebook, YouTube all work normally. No VPN needed.
Does the Thailand eSIM cover Koh Phangan during Full Moon Party?
AIS covers Hat Rin Beach during Full Moon events. With 20,000+ people, all networks congest — speeds slow for everyone. Download accommodation and transport details before arriving.
Can I use my Thailand eSIM in Cambodia or Laos?
No — Thailand eSIM covers Thailand only. For multi-country trips, our SEA 7-Country eSIM covers Thailand + 6 more countries. Or the SG + MY + TH 3-Country plan for the Singapore-Malaysia-Thailand route.
Related Guides
🇹🇭 Thailand eSIM — AIS Network, From $6.99
Bangkok BTS · Phuket beaches · Koh Tao diving · Chiang Mai mountains · Full Moon Party
Get Thailand eSIM from $6.99 →
Multi-country? SEA 7-Country eSIM · SG + MY + TH 3-Country