First, confirm which airport you are actually flying into
Cambodia's capital has moved its commercial air traffic to a new airport. Techo International Airport carries the IATA code KTI. The older Phnom Penh International Airport used the code PNH, and much of the advice still circulating online — forum threads, older blog posts, even some booking confirmations — was written for that airport.
Before you plan anything around airport shopping, check the three-letter code on your booking:
| Code on your booking | What it means |
|---|---|
| KTI | Techo International Airport — the current Phnom Penh gateway |
| PNH | The older Phnom Penh airport code; verify with your airline if you see this |
| REP | Siem Reap — a different city entirely |
| KOS | Sihanoukville — the coastal airport |
If your booking shows PNH and your travel date is recent, confirm with your airline rather than assuming. Airport identities, terminal layouts and the shops inside them change, and this article deliberately does not quote counter names, opening hours or prices for Techo because those details need checking against the airport operator's own current passenger information on the day you travel.
What you can and cannot rely on at the airport
Airport SIM counters exist at Cambodian airports in principle, and the airport operator's own shopping directories list mobile services at some of them. What you cannot rely on from a planning perspective:
- That the counter will be open when you land. Late-night and early-morning arrivals often find shutters down.
- That the queue will be short. A single counter serving a wide-body arrival can absorb half an hour or more.
- That the price on the board is the price you pay. Tourist-facing airport counters are not always the cheapest place to buy.
- That your phone will accept the SIM. Some newer handsets are eSIM-only in certain markets.
None of this means airport SIMs are a scam. It means they are an unverifiable variable in a plan that depends on you getting online quickly — for a Grab ride, a hotel message, or a driver who is waiting for you.
The documents and payment you should have ready either way
Cambodian mobile registration rules and operator practice can change, so treat this as a preparation checklist rather than a promise:
- Passport — carry it, not a photo. Registration for a local SIM generally requires photo identification.
- Cash in US dollars — Cambodia runs a dual-currency economy and small US dollar notes are widely accepted. Carry some regardless of how you plan to pay.
- A working payment card — useful for buying an eSIM online before you fly, where the transaction happens in your own currency.
- Your phone unlocked — a carrier-locked handset will not accept a local SIM or a travel eSIM.
If you are weighing up the two approaches, this comparison is worth reading before you decide: eSIM vs Local SIM in Vietnam covers the registration, price and convenience trade-offs that apply across the region, not just in Vietnam.
The option that removes the airport from the equation
A travel eSIM is a data-only plan you install on your phone before you travel. There is no counter, no queue, no passport check at a desk and no dependence on a shop being open at 1 a.m.
For Cambodia, VietSIM's plans are data-only, which means calls and SMS stay on your home number — you keep your usual number active for messages while your data runs on the local network. That is usually exactly what a short trip needs.
Compare Cambodia plans for your trip at https://vietsim.com/en/esim-cambodia. The store page shows current plan lengths, data allowances and USD prices, with the total including tax shown before you pay. Prices and availability move, so check the live page rather than relying on any figure quoted elsewhere.
A few practical points about the Cambodia plans as sold:
- Plans are data-only — no local phone number.
- They are sold in US dollars, charged through Stripe.
- Plan lengths range from short trips up to 30 days, with daily-allowance and total-allowance options.
- Delivery is by QR code after payment, and installation steps are in your order.
If you are combining Cambodia with Vietnam on one trip, read Vietnam and Cambodia eSIMs: one plan or two? before you buy — the answer depends on how long you spend in each country and whether you cross by land or air.
Install it before you leave home
The single most common reason travellers end up at an airport counter is that they left the eSIM installation until they landed. Do it on your home Wi-Fi, days before departure.
- Buy the plan and receive the QR code by email.
- Install the eSIM while you still have reliable internet.
- Leave it switched off, or set it as a secondary line.
- On landing, enable the eSIM and turn on data roaming for that line only.
- Keep your home SIM active for calls and messages if you need them.
Step-by-step detail, including what to do when the first connection fails, is in Vietnam eSIM Activation — the installation mechanics are the same for a Cambodia plan, and it is the most complete setup walkthrough on the site.
If your phone is an iPhone, Vietnam eSIM for iPhone covers dual-SIM behaviour and keeping WhatsApp working, which matters just as much in Cambodia.
Late arrivals and driver pickup
If you land after midnight, assume nothing will be open. This is the scenario where a pre-installed eSIM earns its price: you can message your hotel or driver the moment you clear immigration, without hunting for a counter.
Two things to arrange before you fly:
- Save your driver's number in your phone while you still have home connectivity.
- Screenshot your booking address in Khmer if you can — it helps with drivers who do not read Latin script.
If you have already bought a plan and lost the order email, there is no public order lookup page; the help centre is the route to a replacement link.
A short decision table
| Your situation | What to do |
|---|---|
| Landing late at night at KTI | Install a Cambodia eSIM before departure |
| Short trip, data only, no local number needed | Cambodia eSIM from the store |
| Need a local Cambodian phone number | Plan to buy a local SIM in the city, with your passport |
| Combining Cambodia and Vietnam | Compare a two-country plan before buying |
| Phone is carrier-locked | Unlock it, or check compatibility before buying anything |
| Already bought, lost the email | Contact the help centre for a new order link |