Mail: Mail sent from Cambodia to Europe may take a while. Make sure your letters/cards are immediately stamped.
E-mail: In Cambodia you can email in Phnom Penh and Siem Reap. Many hotels have Internet capabilities.
Phone: For international calls you must take into account the time difference. Calling from Cambodia is very expensive and the lines are often poor. Calling from a hotel is generally more expensive than calling from a telephone office or post office. Many phone shops offer a fax and Internet service.
In some places you can use your mobile phone. This is however dependent on the device and your provider. For more information on costs and availability, contact your provider. If you want to call to Cambodia: first the dial the country code: 00855, then the area code, then the rest of the number.