## TL;DR
✅ Airalo Cambodia — cheapest eSIM plans in SEA, adequate for most traveller needs
✅ $4.50 for 1GB / $9 for 3GB — remarkably affordable for the coverage you get
⚠️ Cambodia has weaker mobile infrastructure than Thailand or Vietnam — set realistic speed expectations
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## Cambodia: The Budget-Friendly eSIM Market
I’ve spent time in both Siem Reap and Kampot, with a day trip through Phnom Penh in between. Cambodia is genuinely one of the most affordable countries in Southeast Asia for travellers, and the eSIM situation reflects that — Airalo’s Cambodia plans are among the cheapest in their entire Asia catalogue.
The trade-off: speeds and infrastructure are behind Thailand, Vietnam and Malaysia. But for most traveller needs — getting around, booking accommodations, messaging, basic browsing — it works fine.
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## Speed Tests
**Siem Reap (tourist centre):** Airalo — 22 Mbps down / 7 Mbps up
Perfectly adequate for navigation, Google Maps to find temples, and messaging. Video calls were workable.
**Phnom Penh (BKK1 area):** 28 Mbps down / 9 Mbps up — slightly better than Siem Reap, comparable to smaller Indonesian cities.
**Kampot:** 16 Mbps down / 5 Mbps up — usable. Good enough for a slow travel town.
**Between cities (bus journey):** Variable, ranging from 5-15 Mbps. Patchy in rural stretches. Download your podcast before boarding.
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## Airalo Cambodia Plans
– **1GB / 7 days:** $4.50
– **3GB / 30 days:** $9
– **5GB / 30 days:** $12
For a 1-2 week Cambodia trip, the **1GB plan at $4.50** is sufficient if you have hotel WiFi. For a longer stay or heavier use, 3GB at $9 is excellent value.
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## Cambodia eSIM Tips
**Tourist areas are well covered.** Angkor Wat complex and Siem Reap generally have good signal, which is what most travellers care about.
**Phnom Penh has the best speeds.** As the capital, it has the strongest infrastructure.
**Kampot and southern Cambodia:** Signal is adequate in town, drops off in the rural areas outside. Fine for the typical slow travel experience there.
**Koh Rong and islands:** Limited coverage. Treat it as off-grid and enjoy the disconnect.
**No major competitor to Airalo for Cambodia.** Holafly does not have a Cambodia-specific plan as of 2025. Airalo is your default option and it works fine for the market.
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## Cambodia vs Neighbouring Countries
If you are doing a loop through Thailand, Vietnam and Cambodia, Airalo’s regional Asia plan covers all three. You don’t need a Cambodia-specific eSIM unless you want to optimise the per-GB cost for an extended Cambodia stay.
For most visitors, the regional plan’s 10GB at $22 covering all three countries in one purchase is the most convenient and cost-effective approach.
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[IMAGE: cambodia-angkor-esim — View of Angkor Wat temple complex reflection in moat, phone on stone wall showing map app open, no people, early morning golden light, mist over water]