Best eSIM Travel 
Does Airalo Work Everywhere in Asia? Honest Coverage Assessment
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Airalo’s marketing shows a map covered in signal bars. The reality is more nuanced. After extensive travel across Southeast and East Asia, here’s my honest coverage assessment of where Airalo genuinely works, where it struggles, and where it fails.
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Where Airalo Works Excellently
Major Southeast Asian cities: Bangkok, HCMC, Singapore, Kuala Lumpur, Jakarta, Manila, Hanoi. 30-65 Mbps consistently. All providers work here — Airalo is excellent.
Tourist infrastructure areas: Bali (Seminyak, Ubud, Kuta), Phuket (Patong, Kata), Koh Samui, Chiang Mai, Da Nang, Hoi An, Siem Reap, Phnom Penh. Good 4G coverage throughout.
East Asia cities: Tokyo, Seoul, Hong Kong, Singapore — exceptional. Japan and South Korea have world-class infrastructure.
Where Airalo Works Adequately
Rural Thailand: 15-30 Mbps in most rural towns. Drops in mountain areas north of Chiang Mai. Functional for navigation and messaging.
Rural Vietnam: Coverage along Highway 1 (coastal route) is good. Mountain roads (Cat Ba, Sapa, Ha Giang) have weaker signal.
Island hopping: Thai islands (Koh Samui, Koh Phangan, Koh Lanta) have fair coverage. Phi Phi, Koh Tao, remote islands are weaker.
Smaller Cambodian cities: Battambang, Kampot, Sihanoukville — fair to good coverage.
Where Airalo Struggles
Laos rural areas: Airalo covers Laos but rural coverage is limited. The Mekong slow boat route, mountain roads, and smaller towns have very weak signal.
Myanmar: Coverage limited and politically complex situation means infrastructure investment has stalled.
Remote Indonesian islands: Lombok, Flores, Raja Ampat, and eastern Indonesia have limited coverage even with Telkomsel (usually Airalo’s partner).
Mountain trekking routes: Ha Giang Vietnam, Doi Inthanon Thailand, Mount Kinabalu Malaysia — coverage falls significantly with altitude and remoteness.
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Where Airalo Cannot Help
North Korea: Not an Airalo coverage country. (But obviously not a standard travel destination.)
Remote Pacific islands: Some Pacific island nations not in Airalo’s Asia coverage.
Deep ocean: Ferries between major island groups cross signal-free zones. Open sea is always without cellular coverage.
Underground: Bangkok’s MRT tunnels have signal in stations but patchy between them.
The Real-World Implication
For 95% of the itinerary of a typical Southeast Asia traveller, Airalo works perfectly. The gaps appear when:
- You’re travelling deliberately into remote, off-the-beaten-path areas
- You’re on long ferry crossings between islands
- You’re in countries with limited infrastructure (Laos rural, Myanmar)
- You’re trekking at altitude
My approach: Assume Airalo works in towns and tourist areas. Download offline maps for everything else. This mental model has served well across 15+ countries.
Checking Coverage Before You Go
Airalo shows coverage details for each plan in the app:
- Tap a country → see which networks are used
- Network identity gives a clue to coverage strength
- AIS (Thailand) and Viettel (Vietnam) = strong national coverage
Cross-reference with the carrier’s own coverage map for detailed rural assessment.
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