If you want to use your own mobile phone and have a local SIM card for lower the telecommunication cost in your international trip, please check your phone for it is locked or unlocked before this trip.
An easy way to tell what status your phone could be is the money you pay for it. If you paid $, $99 or $199 for a top model Apple, Samsung or Nokia phone, a price that low means your phone has been subsidized, which is locked. If your phone is locked, you won’t be able to use a foreign SIM card. If you paid $500 and up for a top model, your phone is unlocked and you are free to use SIM card of any region.
Cambodia has one of the most competitive mobile markets in the world, with 7 phone carriers for a population of about 15 million. The carriers are Cellcard/Mobitel, Metfone, Smart, qb, Beeline, CooTel and Excell. Don’t be surprised, if you see Cambodians with three or even four cellphones in hand. That is because making cross-network calls is expensive and difficult.
You can buy SIM cards at any of the phone shops or the mobile companies, the latter is more recommended. Bring your passport and a valid visa with you for SIM card registration. In case when you lose the phone, you will get a replacement SIM card.