## eSIM Thailand: DTAC, True Move H, and AIS — I Tested All Three
When I tested every major eSIM for Thailand across four years of living and traveling here, one pattern became impossible to ignore: the network your eSIM connects to matters more in Thailand than almost anywhere else in Southeast Asia. The gap between Thailand’s best network (AIS) and its competitors isn’t just numbers on a speed test — it translates to real moments of lost connectivity on island ferries, patchy calls from Chiang Mai coffee shops, and dropped video meetings.
From my experience traveling Thailand extensively — from the tourist-saturated chaos of Khao San Road to the remote mountains near Pai — here’s the real picture on which network wins, and which eSIM providers actually use it.
## Thailand’s Three Major Networks: Quick Overview
**AIS (Advanced Info Service):**
– Market leader, 40%+ market share
– Best rural and island coverage
– Strongest 4G LTE network nationwide
– Preferred by expats and digital nomads
– Most expensive local SIM option
**True Move H:**
– Second largest network, owned by True Corporation
– Competitive urban speeds, weaker in rural areas
– Popular with younger locals for data promotions
– Good coverage in Bangkok and major cities
**DTAC (now merged with True to form DTAC-TRUE):**
– Merged with True Move H in 2022, operating under combined infrastructure
– Coverage improving as infrastructure merges
– Was historically the weakest of the three; improving post-merger
**The thing nobody tells you:** DTAC and True are now effectively the same company post-merger, combining their tower infrastructure. This merger is still rolling out as of 2025, which means coverage maps are shifting.
## Which Network Does Your eSIM Use in Thailand?
This is the critical question. Here’s what I’ve confirmed through direct testing:
**Airalo Thailand:** AIS network — this is the best choice, and Airalo consistently partners with AIS for Thailand plans.
**Holafly Thailand:** True Move H or DTAC-True (varies by plan tier). Confirmed through Settings > About > Network after activation.
**Nomad Thailand:** True Move H — my direct testing confirmed True routing for most Nomad Thailand plans.
**eSIMdb listings (various providers):** Mix of AIS and True depending on provider and plan type.
**The verdict:** If network quality matters to you, Airalo’s AIS partnership is Thailand’s gold standard for eSIM users.
## Speed Test Results: AIS vs True vs DTAC-True
Here’s what I measured across Thailand over multiple trips:
**Bangkok (Sukhumvit/Silom):**
– AIS (Airalo): 35-52 Mbps download, 15-22 Mbps upload
– True Move H (Holafly/Nomad): 28-44 Mbps download, 12-18 Mbps upload
– Verdict: Urban Bangkok — both work well, AIS marginally faster
**Chiang Mai (Digital Nomad Quarter, Nimman area):**
– AIS: 38-55 Mbps download (excellent coworking connection)
– True: 28-40 Mbps download
– Verdict: AIS clearly better for remote work in Chiang Mai
**Koh Samui:**
– AIS: 20-35 Mbps (4G consistent)
– True: 15-25 Mbps (occasional 3G drops)
– Verdict: AIS more reliable on the islands
**Koh Phangan:**
– AIS: 12-25 Mbps (patchy in jungle areas)
– True: 8-18 Mbps (more patchy overall)
– Verdict: Neither is great; AIS still leads
**Pai and Northern Mountains:**
– AIS: 5-15 Mbps in town, drops in hills
– True: 3-10 Mbps, more dead zones
– Verdict: AIS wins for remote Thailand
**Phuket:**
– AIS: 30-50 Mbps in tourist areas
– True: 25-40 Mbps
– Verdict: Both work well in Phuket’s tourist corridor
## From My Experience on Thailand Islands
The biggest real-world difference I’ve found between AIS and True networks is on Thailand’s smaller islands. When I tested this on a sailing trip from Ko Lipe to Ko Lanta, AIS maintained a usable signal in areas where True dropped to Edge or lost signal entirely.
For island-hoppers, this matters practically. You’re on a slow boat between islands for 4-6 hours. AIS eSIM still gets you to Spotify and WhatsApp out at sea. True eSIM often can’t.
For pure Bangkok tourism, the gap is smaller — True is perfectly adequate in Bangkok, and you won’t notice the difference for Google Maps and restaurant searches.
## Thailand eSIM Pricing Overview
**Short Trips (3-7 days):**
– Airalo 3GB: ~$7 (AIS network)
– Holafly unlimited 7 days: ~$24 (True network)
– Nomad 3GB: ~$6.50 (True network)
– Best value for quality: Airalo
**Medium Trips (7-15 days):**
– Airalo 5GB: ~$11
– Holafly unlimited 15 days: ~$29
– Airalo 10GB: ~$18
– Best value: Airalo 5GB for casual tourists; 10GB for active users
**Digital Nomad Month:**
– Airalo 20GB: ~$30 (AIS)
– Local AIS SIM: AIS Tourist SIM 100GB/30 days for ~THB 299 (~$8.50)
– Best value month: Local AIS SIM by a massive margin
## Local Thai SIM vs eSIM: The Honest Truth
For Thailand specifically, local SIMs are among the world’s cheapest and most accessible:
**AIS Tourist SIM (Suvarnabhumi Airport):**
– 100GB data, unlimited calls (local), 30 days
– Price: ~THB 299 (approximately $8.50 USD)
– Available: Airport arrival hall, 7-Eleven countrywide
– Requires: Passport only
This is, frankly, extraordinary value. If you’re staying in Thailand for more than a week, a local AIS SIM destroys any eSIM option on data volume per dollar.
**Why Still Consider eSIM for Thailand:**
– You land at midnight and airport SIM counters are closed
– You have a dual-SIM strategy (keep home number active)
– You’re on a tight connection and can’t queue
– You’re only in Thailand for 2-3 days as part of a multi-country trip
– You have an older phone with only one SIM slot and don’t want to swap cards
## What I Actually Use in Thailand Now
After four years of testing, my current approach:
**Short visits (1-5 days):** Airalo 3GB Thailand (AIS) — it’s sitting in my phone ready to activate, costs $7, and gets me through without thinking.
**Longer stays (1+ week):** Local AIS Tourist SIM from the first 7-Eleven I pass. Instant, cheap, and the best network anyway.
**Multi-country trip with Thailand stop:** Airalo Southeast Asia regional plan — covers Thailand plus next destinations without SIM swapping.
## Thailand Coverage Gaps: Where No eSIM Saves You
Realistic about where you’ll struggle regardless of provider:
– **Deep jungle (Khao Yai interiors, Doi Inthanon summit area):** Patchy at best
– **Far offshore islands (Similan Islands during liveaboard):** No reliable signal
– **Border areas (Mae Sai, Aranyaprathet):** Degraded coverage
– **Some mountaintop temple viewpoints:** Expect dead zones
For these situations, download offline content in advance and accept that this is one of the joys of actually being somewhere remote.
## The Digital Nomad in Chiang Mai: My Specific Experience
For the Chiang Mai digital nomad question specifically: AIS is non-negotiable. The difference between AIS and True in Chiang Mai coworking spaces (CAMP, Punspace, Yellow) isn’t subtle — AIS gives you consistent 35-50 Mbps that keeps Zoom calls stable. True gives you adequate speeds that occasionally drop enough to freeze video.
When I spent three months in Chiang Mai, my setup was AIS Tourist SIM as primary + Airalo AIS plan as backup/for other countries. Redundancy matters when your income depends on connectivity.
## FAQ: eSIM Thailand DTAC Review
**Does Airalo use AIS or DTAC for Thailand?**
Airalo primarily partners with AIS for Thailand, which is the country’s best network. This is one of the strongest endorsements for choosing Airalo for Thailand over competitors — AIS has the widest 4G coverage, including better rural and island connectivity than True or DTAC-True.
**How has the DTAC-True merger affected eSIM users?**
DTAC and True merged in 2022, and their network infrastructure is still integrating. Combined DTAC-True/True Move H coverage should gradually improve as towers merge. However, AIS still leads in rural and island coverage as of 2025. The merger hasn’t significantly changed the competitive picture yet for international eSIM travelers.
**What is the best eSIM for working in Chiang Mai?**
Airalo (AIS network) is the clear choice for digital nomads in Chiang Mai. AIS consistently delivers 35-55 Mbps in Chiang Mai’s coworking areas, sufficient for Zoom calls, file uploads, and video production. For longer stays, a local AIS Tourist SIM offers extraordinary value (100GB for ~$8.50).
**Is eSIM coverage good on Thailand’s islands?**
AIS (Airalo) maintains the best island coverage among eSIM providers. Popular islands (Koh Samui, Phuket, Koh Lipe) have solid 4G. Smaller or more remote islands (Koh Phangan interior, Koh Chang outer areas) are patchier. 4G coverage extends a few kilometers offshore, useful for boat trips between major islands.
**Can I top up my Airalo Thailand eSIM if I run out of data?**
Yes, Airalo allows in-app top-ups for Thailand plans. If you run out of data, simply open the Airalo app, select your active eSIM, and purchase additional data. The process takes 2-3 minutes and doesn’t require a new QR code scan.