Post is routed by air through Bangkok and is reliable. Most hotels have IDD lines but calls and faxes are very expensive with the average cost of a call to Australia, Europe and US approximately USD 2.50 per minute. Public phones that use pre-paid phone cards are common in Phnom Penh and Siem Reap. Phone cards can be purchased at the post office, most hotels and supermarkets.

Visitors can buy SIM cards from several network operators at Phnom Penh and Siem Reap International Airports. "Travel SIM" cards have a validity of 1 or 2 weeks with different advantages depending on the network. These cards are non-refundable and can be topped up in town. The visitor will have to present his passport of which a copy will be made.