Thailand has one of the world's most traveler-friendly mobile markets. AIS, True Move H, and dtac all sell prepaid tourist SIMs at airports and 7-Elevens for prices that look like a typo to American travelers — 7-day unlimited 4G/5G for ~$10. The trade-off is that you queue for it, fill in a registration form, swap a physical SIM, and lose your home number for the trip.
An eSIM removes all that friction. The Roamzy rate for Thailand is $0.0021/MB (~$2.15/GB). Here's where it wins versus the local-SIM and tourist-pack options.
The three options at Bangkok / Phuket / Chiang Mai airports
- Local prepaid (AIS, True, dtac). Counter at any major airport, also 7-Eleven, also Big C / Lotus. ID + passport. ~$8-15 for 7-day unlimited.
- Tourist eSIM pack. Airalo Asia or Thailand pack, Saily, Holafly Thailand. $6-30.
- Per-MB global eSIM. Roamzy or similar. $0.0021/MB metered, no expiry.
Two-week Thailand trip — the math
Profile: 14 days in Bangkok and the islands, ~150 MB/day cellular use (Maps for tuk-tuk navigation, Grab, translate, occasional photo upload, messaging). Total ~2.1 GB.
| Option | Total cost (14 days, 2 GB) | Friction |
|---|---|---|
| AIS Tourist SIM 15 days | ~$15 | Counter at BKK arrivals, 20-30 min queue, passport, lose home number |
| True Move H 8-day Tourist Pack | ~$10 + need 2 packs for 14 days | Mid-trip refill at 7-Eleven or app |
| Airalo Thailand 3GB / 30 days | ~$11 | Pack with expiry; you'll waste ~1 GB |
| Roamzy per-MB | ~$4.30 | Install at home before flying, top up $20, balance carries to next trip |
When the local SIM still wins
Thai prepaid is so cheap at the wholesale level that if you'll consume more than ~7 GB, an AIS or True unlimited week-pack at ~$10 starts pulling ahead. This matters in two specific scenarios:
- Streaming on cellular. Some travelers spend long boat rides between islands streaming Netflix. At 1 GB/hour for HD, two hours/day for 10 days = 20 GB. Per-MB at $0.0021 × 20,000 MB = $42. AIS unlimited 15-day at $15 wins this scenario by a wide margin.
- Working remote on Thai 4G/5G. Video calls + screen sharing burn through 1-2 GB/hour. If you're a digital nomad working a full week, get a local SIM as your daily driver and keep the global eSIM as backup.
For nomads cycling through Asia rather than just visiting Thailand, the calculus changes — see digital-nomad eSIM guide for the multi-country math.
Coverage and 5G across Thailand
Thailand's three big carriers have near-identical coverage in tourist zones:
- AIS — generally best on the islands (Koh Samui, Phuket interiors, Krabi area).
- True — often the fastest in central Bangkok and Chiang Mai, more aggressive 5G rollout.
- dtac — patchy on islands, fine in cities, the cheapest at the wholesale level.
Roamzy's eSIM connects to whichever carrier has the strongest signal at your activation point, which is typically AIS at airports and True in dense Bangkok. For most travel patterns this is a non-decision — all three deliver 4G/5G to your phone without you noticing the underlying carrier.
Crypto top-up: useful for Thailand?
Thai banks are not particularly aggressive about blocking foreign-merchant card transactions, so most travelers can use a regular card to top up an eSIM without trouble. The case for stablecoin top-up in Thailand is narrower: you're a long-stay nomad, you're paid in stablecoin, you don't want to deal with bank-FX-margins on every top-up. For a 2-week tourist trip, a regular card payment is fine.
Practical setup notes for Thailand
- Activate before landing. Install the QR while on home WiFi; the eSIM goes live the moment you connect to a Thai network at BKK / DMK / HKT.
- Disable home roaming. Thai carriers are not in any "Like At Home" agreement; if your home plan is on physical SIM and you don't disable roaming, you'll burn home-carrier rates while the eSIM sits idle.
- If using Grab / FoodPanda heavily: these apps push location updates aggressively and can burn 50-100 MB/hour during heavy use. Per-MB still cheap, but worth knowing.
- Consider a local SIM for second device. If you bring an iPad / hotspot for working, a $5 local SIM in that device + per-MB eSIM in your phone is the cheapest setup for nomads.
For setup screens specifically, iOS install guide and Android install guide.
Crossing borders from Thailand
Common itinerary: Thailand + Cambodia (Angkor) + Vietnam. Without changing eSIMs:
- Thailand → Cambodia — Cambodia rate is around $0.0046/MB on Roamzy. Same eSIM keeps working, you do nothing.
- Cambodia → Vietnam — Vietnam rate similar to Thailand. Vietnam for the page.
- Thailand → Malaysia / Singapore — both at slightly higher per-MB than Thailand, both seamless to switch.
The strong case for a per-MB global eSIM in Southeast Asia is precisely this: travelers who plan to visit 2+ countries on one trip waste hours buying separate prepaid SIMs at each border, when the meter just keeps ticking the whole time on a per-MB profile.
Bottom line for Thailand
For typical 2-week tourists: per-MB eSIM at $0.0021/MB is meaningfully cheaper than every other option AND removes the airport-counter friction. The break-even where AIS unlimited becomes worth the queue is roughly 7 GB of actual usage.
For digital nomads doing Bangkok or Chiang Mai for 4+ weeks while working remote: dual setup (Thai prepaid local + global per-MB eSIM as backup / cross-border) is genuinely the cheapest end-to-end answer. digital-nomad eSIM guide walks through this hybrid in detail.
Live Roamzy Thailand rate plus 191 other countries: live per-MB price page. Country page with carrier notes: Thailand country page.
Sources & further reading
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