Best eSIM Travel 
Fastest eSIM Networks in Thailand — Speed Test Results 2025
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I ran systematic speed tests across five eSIM providers and two local Thai SIMs across Bangkok, Chiang Mai, Koh Samui, and rural northern Thailand. Here are the detailed results.
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Compare eSIM Plans →Testing Methodology
- Tests run on an iPhone 15 Pro (5G capable)
- Used Speedtest.net by Ookla
- Tests run at different times of day (9am, 2pm, 8pm)
- Same locations for all providers where possible
- Results = average of 3 tests per provider per location
Bangkok Speed Tests
| Provider | Network Used | Download (avg) | Upload (avg) | Latency |
|---|---|---|---|---|
| Airalo | AIS 4G | 52 Mbps | 28 Mbps | 18ms |
| Holafly | True Move H | 44 Mbps | 24 Mbps | 22ms |
| Nomad | AIS 4G | 48 Mbps | 25 Mbps | 19ms |
| GigSky | AIS 4G | 50 Mbps | 27 Mbps | 18ms |
| Local AIS SIM | AIS 4G | 58 Mbps | 32 Mbps | 15ms |
| Local True SIM | True Move H | 51 Mbps | 29 Mbps | 17ms |
Bangkok verdict: All providers excellent. Local SIMs slightly faster than roaming eSIMs — possibly due to higher network priority for native subscribers. For more information, check our guide on Best eSIM Cards for Southeast Asia Travel (Airalo, Holafly,.
Chiang Mai Speed Tests
| Provider | Download (avg) | Upload (avg) | Latency |
|---|---|---|---|
| Airalo | 38 Mbps | 18 Mbps | 22ms |
| Holafly | 31 Mbps | 15 Mbps | 28ms |
| Nomad | 35 Mbps | 17 Mbps | 24ms |
| Local AIS SIM | 45 Mbps | 22 Mbps | 18ms |
Koh Samui Speed Tests
| Provider | Download (avg) | Upload (avg) |
|---|---|---|
| Airalo | 28 Mbps | 12 Mbps |
| Holafly | 22 Mbps | 9 Mbps |
| Nomad | 24 Mbps | 10 Mbps |
| Local AIS SIM | 32 Mbps | 14 Mbps |
Rural Northern Thailand (Mae Hong Son)
| Provider | Download (avg) |
|---|---|
| Airalo (AIS) | 12 Mbps |
| Holafly (True) | 7 Mbps |
| Nomad (AIS) | 11 Mbps |
| Local AIS SIM | 18 Mbps |
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Key Findings
- AIS-backed plans consistently outperform True Move H across all locations tested
- Local SIMs are 10-30% faster than equivalent eSIM roaming plans — likely due to native subscriber priority
- Rural performance advantage of AIS is significant — Holafly (True) is noticeably slower in Mae Hong Son
- Bangkok differences are minimal — any provider works excellently in urban Bangkok
- Latency is good across all providers — under 25ms for all in Bangkok
What This Means for You
- For Bangkok and cities: Any provider is fine, differences are minimal
- For rural northern Thailand: Choose AIS-backed plans (Airalo, Nomad, GigSky)
- For maximum speed: Local AIS SIM outperforms all eSIM providers
- For convenience + speed balance: Airalo (AIS) is the winner
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James Whitfield
James Whitfield is a travel tech journalist with 8 years of experience covering mobile connectivity abroad. A former editor at TechRadar's travel section, he has tested over 40 eSIM providers across 60+ countries. He shares honest reviews on best-esim-travel.com.