SIM Cards and Mobile Internet in Cambodia: Operators, eSIM and Coverage

Prepared by the NovAsia Editorial Team

For a short visit or a longer stay in Cambodia, most people will be best served by a local number from one of the three major operators: Smart, cellcard or Metfone. All three provide mobile data in Phnom Penh and other major cities, but the quality of service can vary sharply by building, street, floor and travel route.

That is why the largest data allowance is not necessarily the best deal. First decide whether you need a Cambodian phone number, a physical SIM or an eSIM. Then test the service where you will actually live, work and travel before connecting the number to banking, delivery and other important accounts.

A tourist and a long-term resident need different things

The most important distinction is not between a “cheap” and an “expensive” plan. It is between temporary connectivity and a number that becomes part of everyday life.

A visitor staying for a week or two may need only a ready-made tourist package, bought at the airport or installed in advance as an eSIM. Someone renting a home, receiving deliveries, opening a local bank account or returning regularly to Cambodia is usually better served by a normal prepaid number registered in their own name.

A Cambodian number is useful for more than calls. It may be used by drivers, couriers, landlords, clinics, schools, banks and service providers. A travel eSIM that supplies data only can handle maps and messaging, but it does not provide the local number required for many of those interactions.

For short trips, convenience and package duration matter most. For long-term use, ownership, recovery after loss, account validity and the ability to manage the line from abroad matter more than headline gigabytes.

Smart, cellcard or Metfone: there is no universal winner

The three operators most foreign residents encounter are Smart Axiata, cellcard and Metfone. Each offers prepaid services, mobile-data packages and an account-management app. All are expanding newer networks, but national 5G development does not mean that every room or provincial road has the same signal.

Smart may appeal to users who value app-based management and online eSIM activation. It sells eSIM through SmartNas, its website and official shops. It has also offered tourist packages at Cambodia’s international airports. At the time reviewed, one advertised package included 30 GB for 15 days at $5 with calls and texts. That is a snapshot, not a permanent price.

cellcard also offers physical SIMs and eSIMs and provides account management through its app. Its published eSIM information states that foreign applicants need a valid passport and visa. A digital profile may be delivered through the app, email or Telegram as a QR code, depending on the process in use.

Metfone has a broad national presence and may be practical for people who travel frequently beyond central Phnom Penh. It offers prepaid packages, eSIM and several top-up channels. Even so, a general coverage claim does not prove that the service will work well on a particular rural road or inside a specific concrete building.

This is not a quality ranking. A person living in BKK1 and someone travelling between Phnom Penh, Kampot and rural districts may reach different conclusions.

The most practical approach is to avoid attaching a new number to every important service on day one. Buy a prepaid SIM, test calls, data and tethering for several days, and only then decide whether it should become your permanent local number.

Physical SIM or eSIM

eSIM is a digital mobile profile installed through a QR code or operator app. It is especially convenient on dual-SIM phones because a home-country SIM can remain active for banking messages while the Cambodian line handles data and local calls.

Its main advantages are convenience and the absence of a small plastic card that can be lost. It also leaves the physical slot free. However, eSIM does not remove identity-registration requirements, and moving the line to a new device may require reissuing or reinstalling the profile.

Some operators allow the profile to be downloaded again after it has been removed from the previous device. The QR code and account access therefore need to be protected carefully. Anyone who obtains the eSIM credentials may try to take control of the number.

A physical SIM is simpler for people who change phones often, use a basic backup handset or want to place the card in a mobile router. Its weakness is loss or damage. If it was purchased from an informal seller and registered in someone else’s name, recovery can become difficult.

Before ordering an eSIM, confirm:

1. The exact phone model supports eSIM.
2. The handset is not locked to an overseas carrier.
3. Physical SIM and eSIM can operate together as needed.
4. Tethering or personal hotspot works on the chosen plan.

After activation, set the Cambodian line as the data line. A dual-SIM phone may otherwise continue using expensive roaming on the foreign line even after the local eSIM is installed. Disable data roaming on the home-country SIM unless it is intentionally required.

Where to buy and which documents to bring

The safest channels are an operator-owned shop, the operator’s official website or app, or an authorised airport counter. A neighbourhood shop may be quicker, but problems often appear later if the number was registered to the wrong person or the passport data were entered incorrectly.

Foreign customers generally need a valid passport. The operator or sales channel may also request a valid visa, a document photograph and facial verification. Published cellcard information, for example, identifies a valid passport and visa for foreign eSIM applicants. Smart uses document upload and identity checks in its registration process. Procedures can change, so check the operator’s current instructions before purchase.

The number of SIM cards that may be registered to one identity document is limited. Smart and cellcard both refer to a maximum of five registered SIMs per customer document. Do not use your passport to register numbers for friends, tenants, employees or casual acquaintances. The registered customer may carry responsibility for the account and controls its recovery.

After purchase, verify that the number is registered to you. Operators provide account or support channels for checking customer details. Correct any error in the name, passport number or date of birth immediately.

Keep a secure record of:

• the number in international format beginning +855;
• the SIM packaging or card details;
• proof of registration;
• the eSIM QR code where it is required for recovery;
• the current package expiry date;
• official support contacts.

Do not send passport images or an eSIM QR code to an unknown seller in a messaging app. Control of the number can affect banking alerts, email, social accounts and delivery services.

How to read mobile-data offers

Mobile data is usually inexpensive by international standards, but a headline allowance needs context. Check the validity period, auto-renewal, network access, tethering rules, included calls and what happens after the package ends.

Validity may be counted as full 24-hour periods from activation rather than ending at midnight on the final calendar day. cellcard, for example, explains this approach for some packages. A seven-day package activated on Tuesday evening may expire around the same time the following Tuesday. Check the exact expiry in the app before an important call or journey.

Published examples at the time reviewed included Smart packages of 20 GB for $1.50 over seven days, 90 GB for $6 over 30 days and 150 GB for $10 over 30 days. Treat these as dated illustrations, not permanent market prices. Promotions and bonuses change frequently.

Before choosing a plan, ask:

• How much data do you use each week or month?
• Do you need a local number or only data?
• Will you tether a laptop?
• Do you need reliable provincial coverage?
• Must the number remain active after you leave?
• Do you need to receive messages while abroad?

Maps, messaging and ride-hailing use modest amounts of data. Video calls, file uploads and daily tethering consume far more. A large allowance will not fix weak indoor coverage.

A separate risk is using data without an active package. The operator may deduct from the main balance at a standard rate, which can consume credit quickly. After topping up, confirm that the package is active before switching mobile data back on.

5G and real-world coverage

Cambodia’s 5G network is expanding, but it should be viewed as developing infrastructure rather than a guarantee of service everywhere. In February 2026, the Telecommunication Regulator of Cambodia reported that Smart, Viettel Cambodia under the Metfone brand, and CamGSM under the cellcard brand had deployed a combined 1,494 5G stations.

That figure shows national rollout, not the signal in a particular apartment. Performance is affected by floor level, concrete walls, coated glass, room orientation, handset model and network congestion. A phone may show excellent results outdoors and weak service in a bedroom. Evening speeds may fall even where morning performance is strong.

A useful test takes little time:

1. Measure data performance in the morning, evening and working hours.
2. Test calls and data in every important room.
3. Tether a laptop and complete a real video call.
4. Test the route to work, school or the gym.
5. Compare the result with a second operator.

Do not choose a plan only because the phone displays a 5G icon. Stable 4G may be more useful than intermittent 5G available only by the window.

For remote work, use mobile data as a backup to fixed home internet until it has proved stable over several days. When travelling, download offline maps and accommodation details in advance. Even an operator with broad national coverage can have weak sections on rural roads, islands and remote routes.

Where connectivity is business-critical, keeping two prepaid lines from different operators is often more effective than buying the largest package from one network.

Topping up and keeping the number active

Each major operator has an app showing balance, package allowance, validity and available bundles. Top-ups may also be available through official websites, Cambodian banking apps, shops and recharge vouchers. A foreign resident should check whether an international card can still be used after leaving the country.

The main account balance and the data package are separate. Money can remain in the account after a package expires, or a package may still be active while there is not enough main credit for a call outside the included allowance. Check both.

Prepaid numbers have an activity period. If the line is not topped up or used as required, service may be restricted and the number can eventually be recycled. cellcard’s terms, for example, describe a period during which an expired main balance may be restored after a top-up, but that is not a universal guarantee that every number will remain recoverable indefinitely.

Before leaving Cambodia, especially where the number is linked to banking or email:

• check the line’s active-until date;
• confirm the minimum action or top-up needed to extend it;
• enable roaming if overseas messages are required;
• make sure you can still log in to the operator app;
• save support details;
• set a calendar reminder for renewal.

Roaming is best activated before departure. If the line no longer registers on a foreign network, remote troubleshooting can be difficult. Keep mobile data roaming off unless you deliberately intend to use it; overseas data can cost far more than local service.

Protecting the number and recovering it after a lost phone

After a few months, a Cambodian number can become part of a person’s digital identity. It may be linked to banking, rent, deliveries, medical records, messaging and password recovery. Losing access can be more disruptive than the cost of a new SIM.

Do not build your main account ecosystem around a number registered to a seller, friend or employee. The operator will normally rely on the registered identity when a replacement or transfer is requested.

Useful safeguards include:

• set a SIM PIN and store the PUK securely elsewhere;
• use a strong phone lock and protect the operator app;
• never publish or forward the eSIM QR code casually;
• never disclose one-time codes to “support”, couriers or sellers;
• contact the operator quickly after losing the phone;
• keep registration details current.

Smart warns that mobile numbers are often used for banking and social accounts and advises customers not to transfer a registered SIM casually. cellcard’s terms also require customer details to remain accurate and warn that mismatch may affect service or rights to the number.

If data suddenly stops working, first check package expiry and remaining allowance. Then verify that the Cambodian line is selected for mobile data, restart the handset, toggle flight mode and check automatic network selection. If the signal works outside but not inside, the problem is likely indoor coverage rather than the tariff.

For a failed eSIM installation, do not rescan the same code repeatedly without checking the process. Confirm that the phone has Wi-Fi, that the old profile was removed where required and that the QR code has not already been consumed. Then contact official support with the passport and registration details.

Three practical scenarios

A visitor staying ten days. The priorities are maps, messaging, transport apps and delivery. An airport tourist package or a travel eSIM may be enough. A local number is still helpful for drivers and bookings, but a monthly package is usually unnecessary.

A remote worker staying three months. This user needs a registered local number, substantial data and a backup for home internet. Test two operators inside the apartment and verify tethering. Fixed broadband should remain the main work connection where possible.

A person dividing time between Cambodia and another country. The central issue is not maximum data. It is keeping the number alive, topping up from abroad and receiving security messages while roaming. The best choice is an operator with manageable account tools and a line registered correctly in the user’s own name.

These examples show why no single plan is best for everyone. Tourists pay for speed of setup, remote workers for resilience and long-term residents for account continuity.

Final takeaway

The safest sequence is straightforward: buy through an official channel, register the number in your own name, verify the profile, test signal in the places that matter and only then link the number to banking and other critical services.

eSIM is convenient for dual-line phones, while a physical SIM remains useful for mobile routers and frequent device changes. Smart, cellcard and Metfone can all provide workable service, but operator name, a coverage map and a 5G symbol do not prove performance in a particular home.

For long-term use, three things matter most: the number belongs to you, it can be recovered and its validity is actively managed.

Sources

1. Telecommunication Regulator of Cambodia — official announcement on 5G deployment by Smart, Viettel Cambodia and CamGSM, 12 February 2026.
2. Smart Axiata — Smart Traveller SIM, Smart eSIM and current data-package pages, reviewed 25 June 2026.
3. Smart Axiata — SIM registration, activation and account-safeguarding guidance.
4. cellcard — SIM and eSIM application information for foreign customers, including identity-document requirements and profile transfer.
5. cellcard — prepaid-account terms covering validity and customer-profile accuracy.
6. Metfone — official mobile-service, eSIM, prepaid-package and top-up information, reviewed 25 June 2026.

Frequently asked

Which SIM is most practical for living in Cambodia long term?

A normal prepaid number registered to the user’s own passport is usually more useful than a disposable travel eSIM because it can support banking, delivery and account recovery.

How should someone choose between Smart, cellcard and Metfone?

Test the signal at home, at work and on regular routes rather than relying on a general ranking. Coverage and speed can differ substantially even within one building.

How can a Cambodian number be kept after leaving the country?

Check the activity period, top-up rules, overseas payment options and roaming. Where the number is linked to a bank or important account, set a reminder before it expires.