Best eSIM for Cambodia
Cambodia has workable 4G in Phnom Penh, Siem Reap and main towns, but coverage drops sharply in the Cardamom Mountains and remote border regions. A travel eSIM is almost always cheaper than carrier roaming.
Last checked: May 2026. Plans and prices change — verify before purchase.
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How much will it cost for your trip?
Cambodia has 3 mobile networks: Smart Axiata (fastest 4G in major cities and along the Phnom Penh-Siem Reap corridor), Metfone (Vietnamese-owned via Viettel — widest coverage, the strongest choice for rural and remote areas including the outer Angkor temples), and Cellcard (urban-focused, noticeably slower in Phnom Penh per first-hand testing). Coverage at Angkor is variable: the central complex (Angkor Thom) has reasonable signal on Smart and Metfone, but more remote temples — Banteay Srei, Beng Mealea, Koh Ker, the outer roads — can be patchy regardless of carrier. Most travel eSIMs route via Smart or Metfone (Airalo uses both; Nomad and aloSIM use Metfone only). For trips that include rural Mondulkiri, Ratanakiri or the Cardamom mountains, prefer a Metfone-routed eSIM. Download offline maps for the entire Angkor zone before leaving Siem Reap, especially for sunrise trips or full-day temple loops.
Multiple traveller reports flag pricing inflation and counterfeit SIM cards at Phnom Penh airport sales points — including SIMs with reduced data balances or shorter validity than advertised. A travel eSIM installed before your flight bypasses this risk entirely. If you prefer a physical local SIM, buy at an official Cellcard, Smart Axiata or Metfone store once in the city — same product, proper pricing, around $1–2 for the SIM with affordable tourist data packages. Cambodian law requires passport presentation for SIM registration (KYC enforced for all four carriers including eSIMs); travellers should also be aware of the 60-day IMEI registration exemption for tourist devices, which means short-stay visitors do not need to register their handset with the regulator. International travel eSIMs are exempt from local SIM registration entirely — they roam onto Cambodian networks via international agreements.
Coverage notes cross-referenced from multiple independent sources.
eSIM — Cambodia
Network coverage in Cambodia
Three major networks operate in Cambodia: Smart Axiata (strongest urban coverage and fastest 4G in Phnom Penh and Siem Reap), Metfone (widest rural and border-zone footprint) and Cellcard (urban-focused). For Phnom Penh, Siem Reap, Sihanoukville and Kampot, all three deliver reliable 4G. 5G launched commercially in early 2026 (Smart Axiata, Metfone and Cellcard), so far concentrated in Phnom Penh and the larger provinces and still limited next to 4G, though travel eSIMs increasingly pick it up in the cities.
Remote areas — the Cardamom Mountains, Mondulkiri, Ratanakiri and border crossings with Laos or Thailand — have limited or no signal on any network. Provider routing: Airalo routes via Smart Axiata. aloSIM routes via Metfone only. Roamless, Saily and Yesim do not publicly disclose their Cambodian carrier. For Angkor temple coverage and rural itinerary advice, see the field tip above.
Roaming or eSIM — should you buy?
Arrival protocol in Cambodia
VPN, passwords and documents
Cambodia's 2021 National Internet Gateway decree routes all traffic through a government-controlled gateway. Most mainstream apps work without issue, but a VPN may be useful as a backup if specific content becomes inaccessible. On public Wi-Fi (hotels, cafés), a VPN also masks your traffic from the network operator. A password manager and a secure cloud backup of your passport, insurance certificate and hotel bookings can also be useful — keep an offline copy too. None of these are mandatory.
Mistakes to avoid in Cambodia
Common questions about eSIM in Cambodia
Continuing your trip in Southeast Asia?
Many travellers combine Cambodia with neighbouring countries. See our guides for eSIM in Vietnam, eSIM in Thailand and eSIM in Laos. For multi-country trips combining Cambodia with neighbouring Southeast Asia destinations, our Asia regional plan comparison may be useful.