I landed in Bangkok with four different eSIMs installed and a local SIM card as backup, determined to finally answer the question every digital nomad Facebook group argues about endlessly: which eSIM is actually worth your money in Southeast Asia? Six weeks, three countries, and more mobile data settings menus than I care to admit later, here’s exactly what worked, what didn’t, and where a local SIM still quietly beats every eSIM on the market.
eSIM vs. Physical SIM: The Real Trade-offs for Nomads
Before comparing providers, it’s worth settling the bigger question: should you even bother with an eSIM, or just grab a local SIM at the airport?
eSIMs win on convenience. You can install one before you even board your flight, activate it the moment you land, and skip the airport SIM kiosk queue entirely. For multi-country trips, a single regional eSIM means you’re not hunting for a new SIM card every time you cross a border.
Local SIMs win on raw price and speed. A Thai AIS tourist SIM running about 300 baht (roughly $8.50) for 30 days with 30GB of data consistently beats every eSIM option on pure value — you just need your passport, a working phone, and a bit of patience at a 7-Eleven or carrier shop.
eSIMs win on setup time; local SIMs win on activation reliability. eSIM installation takes under five minutes, but activation isn’t always instant when you land — some travelers report a frustrating delay getting connected in arrivals halls, particularly in countries with stricter carrier verification. A local SIM purchased in-country, while slower to set up initially, tends to connect reliably right away since it’s activated in person.
My verdict after six weeks: use an eSIM for your first 2–3 days in any new country, then switch to a local SIM once you’ve found a shop and settled in, if you’re staying longer than a couple of weeks.
The Comparison: Airalo vs. Holafly vs. Local Telcos
Provider |
Price |
Coverage |
Speed/a Throttling |
Best For |
| Airalo (regional Asia plan) | From $5/1GB (7 days); unlimited plans from ~$11/3 days | 18 countries incl. Thailand, Vietnam, Indonesia | Reliable in cities; some report Japan/Korea activation hiccups | Short trips, predictable data users, budget travelers |
| Holafly (Asia plan) | ~$27–37 for 7 days unlimited
|
16 countries incl. Thailand, Vietnam, Indonesia | Unlimited but undisclosed throttling — often noticeable after 2–5GB/day | Heavy data users who want zero mental overhead |
| AIS (Thailand local SIM) | ~$8.50/30 days, 30GB | Thailand Only | Full-speed 4G/5G, no throttling drama | Longer Thailand stays, best pure value |
| Viettel (Vietnam local SIM) | Varies, often discounted for travellers | Vietnam Only | Strong urban coverage, fast activation | Vietnam-specific stays |
| Telkomsel (Indonesia local SIM) | Low cost, widely available | Indonesian Only | Strong across Bali and major islands | Bali/Indonesia-based nomads |
The pattern that emerged across all three countries: Airalo consistently offered the best per-GB value for predictable data users, while Holafly’s unlimited plans made sense only if I was a genuinely heavy daily user — otherwise I was paying a premium for data I wasn’t using. Local SIMs beat both on pure cost every single time, but cost you setup time and occasionally a bit of language-barrier friction.
Country-by-Country Recommendation
Thailand: Grab an eSIM (Airalo or Holafly) for your first few days in Bangkok, then swap to an AIS tourist SIM — widely available at 7-Elevens across the country — for the rest of your stay. This combination consistently gave the best balance of immediate connectivity and long-term value across Bangkok, Chiang Mai, Phuket, and Koh Samui.
Vietnam: Vietnam’s regional eSIM coverage is solid in major cities like Hanoi and Ho Chi Minh City, but a local Viettel SIM offers noticeably better value if you’re staying more than a week or two — and hostel staff can often point you toward traveler discounts not listed online.
Indonesia: This is where local SIMs matter most. Telkomsel delivers dependable coverage even in more remote parts of Bali and Lombok, where regional eSIM performance can get patchy. If you’re island-hopping to smaller destinations like the Gili Islands, know that signal limitations there apply regardless of which provider you choose — it’s an infrastructure issue, not a SIM issue.
Multi-country circuits (Thailand + Vietnam + Indonesia in one trip): A single regional eSIM from Airalo or Holafly genuinely earns its keep here, saving you the hassle of managing three separate local SIMs and phone numbers across one itinerary.
Common Setup Mistakes to Avoid
Forgetting to configure dual-SIM settings correctly. If you’re keeping your home SIM installed alongside a new eSIM, make sure your data settings are pointing to the eSIM as your primary data line — otherwise you’ll rack up expensive roaming charges on your home carrier without realizing it.
Activating too early or too late. Most eSIMs only start counting validity days from first connection, not from purchase — install it before you travel, but don’t manually activate until you land, so you don’t waste paid days sitting in your home country.
Assuming “unlimited” means unlimited. Holafly and similar providers rarely disclose exact throttling thresholds, and multiple testers report noticeable slowdowns after 2–5GB of daily use. If you’re a heavy user — video calls, large uploads, streaming — check current throttling reports before assuming true unlimited speed.
Skipping the backup plan entirely. Even the best eSIM can fail to activate on arrival. Always have a backup: a second eSIM installed and ready, or knowledge of the nearest shop for a local SIM, so a connectivity hiccup doesn’t turn into a lost work day.
Get Connected Before You Land
Don’t wait until you’re standing in an arrivals hall trying to figure out your data plan while your travel companions watch you get increasingly frustrated with your phone settings. [Install an Airalo eSIM before you fly] for reliable, affordable data-only coverage across Thailand, Vietnam, and Indonesia from the moment you land. If you know you’ll be a heavy daily user — video calls, uploads, remote work — [compare Holafly’s unlimited Asia plans] so you never have to think about data caps while you’re trying to get work done.