Cambodia has very liberal visa regulations. It is meant to say a valid passport and visa are required for entry. Visas can be obtained at Phnom Penh International Airport or Siem Reap (Angkor) Airport. All travelers have to do is bring along two passport size photos and fill up visa application. A one-month tourist visa costs US$20 while a business visa costs US$25.00. Visa application form will be provided on inbound flights. Visas are also available at Thai/Cambodian overland border crossing.
Tourist visas can be extended for one month, but only one time. Business visas can be renewed indefinitely. Renew visas through a travel agent or the 'Department for Foreigners' on Confederation de Russie ('Airport Road'), located opposite Phnom Penh International Airport. Renew Diplomatic, Courtesy and Official visas at the Consular section of the Ministry of Foreign Affairs.
The Ministry of Foreign Affairs and International Cooperation has launched e-Visa which enables you to apply for a Cambodia travel visa online. Instead of applying through Cambodian Embassy, all you need is to complete the online application form and pay with your credit card. You will get your visa approved within 3 business days.
Now you can obtain the Cambodian Visa by applying online now at http://www.evisa.mfaic.gov.kh Just log in and apply your Cambodian visa at your finger click.
International Departures: US$25
Domestic Departure: US$6
The Cambodian official currency is Khmer Riels, However US Dollar is widely accepted in Cambodia. US Dollar has been used as commonly as Khmer Riels for High-Value items particularly dealing in the Hotels, Restaurant, Shops, high value possessions and Taxi.
Cambodian hard currencies printed in : 50 Riels, 100 Riels, 200 Riels, 500 Riels, 1,000 Riels, 2,000 Riels, 5,000 Riels, 10,000 Riels, 50,000 Riels, 100,000 Riels. Tourist should carry some Khmer Riels for some small value deals.
Credit card, Master Card, RJB, and Travel Checks are accepted in major Hotels, Restaurants, and Shops. Most Banks in Cambodia accepts above Cards for encashment manually or ATM machines and located in most high-population provinces such as Phnom Penh, Siem Reap, Sihanouk Ville and Battambong.
Currency policy in Cambodia haven't yet applied and seem to be freely convenience for tourist as they are at home unlike in Thailand, Vietnam, Malaysia and Singapore.
US Dollar against Khmer Riels, Rate at Shop, Restaurants and Hotels are approximately around 4,000 Riels/ USD. You can do the exchange in many places outside the banks and they are located almost everywhere near the markets.
1. Phnom Penh International Airport
2. Siem Reap Angkor International Airport
3. Sihanouk Ville International Airport
1. Thailand- Cambodia
There are everyday direct flights from Thailand to Cambodia either to Phnom Penh or Siem Reap. Other alternative you could go to Cambodia by overland border as following:
a). Aranyaprathet / Poipet, Cambodia (Working hours 8:00 am to 8:00 pm)
This official land border is good for tourists who wish to visit Siem Reap, Battambong and it takes about 5 hours by open-bus or shared taxi to get Siem Reap. Road condition from Poipet to Siem Reap is not that developed but a four wheels drive will be the best transportation recommended for this wet season (July to November). In the dry season from (December to June) is considerable for time to travel by this road.
b). Hat Lek / Cham Yeam-Koh Kong, Cambodia (Working hours 8:00 am to 8:00 pm)
This official overland border is good for tourist who wish to visit Sihanouk Ville, Phnom Penh, and the tourist could go to Sihanouk Ville by Boat which depart very morning 8:00 am. It takes 4 hours to reach Sihanouk Ville while at least 5 hours by taxi to Sihanouk Ville. The road condition from Koh Kong to Sre Ambil is a bit difficult while from Sre Ambil to Phnom Penh, Sihanouk Ville, Kampot are years round good condition and well-maintenance. You also could get upon arrival visa at this border check points as well.
c). Chong Jom / O'Smach, Cambodia
This is also an official overland border in the remote provinces, Oddor Meanchey, where tourist could obtain their upon arrival visa at the check points. Fewer tourists get into Cambodia by this check point.
d). Chong Sa Ngam / Anlong Veng, Cambodia
This is remote border, where was former Khmer rouge resident located and the last district to re-united after a long war in Cambodia. Tourist passes this border mostly from Sisaket, Thailand. Visa upon arrival is available.
2. Vietnam- Cambodia
There are everyday direct flights from Vietnam to Cambodia either to Phnom Penh or Siem Reap. Other alternative you could go to Cambodia by overland border as following:
a). Moc Bai / Bavet, Cambodia (Working Hours 8:00 am- 5:00 pm)
This is a biggest official border get between Vietnam and Cambodia, It takes about 5 hours to travel from Bavet to Phnom Penh and Visa upon arrival is available. There are several local taxi, mini-van, bus are waiting to transfer you until late evening. The road condition is good and well-maintenance.
b). Chau Doc / Kaam Samnor, Cambodia (Working Hours 8:00 am - 5:00 pm)
This is an official river-border on the Mekong River, is becoming the popular get way for tourists come to Cambodia from Vietnam by boat, ferry. It takes about 6 Hours to reach Phnom Penh Port. If you wish to go to visit Siem Reap, the only way is to take private taxi otherwise you will stay overnight in Phnom Penh wait for the morning or noon bus. Cambodian visa is available upon arrival.
c). Tinh Bien / Phnom Den, Takeo, Cambodia (Working Hours 8:00 am - 5:00 pm)
Tourist Visa upon arrival is unknown, but it is good for those who prefer to visit Kampot and Sihanouk Ville rather than Phnom Penh or Siem Reap. It takes 2-3 hours to get Kampot and Sihanouk Ville by mini-van or taxi.
There are everyday direct flights from Lao to Cambodia either to Phnom Penh or Siem Reap. Other alternative you could go to Cambodia by overland border as following:
a). Voeung Kam / Dom Kralor, Cambodia
Tourist Visa is available upon arrival; it is good for tourist coming from Laos to Visit Cambodia through Steung Treng to Phnom Penh or Siem Reap. The road condition is comparatively good condition. From this border, there is another border on the river-crossing which the Visa might not be available on arrival. From the border, you could choose 3 different tastes of Cambodia,  City of Phnom Penh,  Heritage Angkor-Siem Reap and  Tribe-Hills (Mondolkiri and Rattanakiri).
The country code for Cambodia is 855. The telephone networks consists of satellite, landlines, cellular, GSM and radio systems which connect Phnom Penh, Siem Reap, Sihanoukville, Battambang, Kompong Cham and other provinces internationally. International dialing can be done at main postal offices, private business centers or hotel or at public phone booths, which can be found at postal office, main streets, gas stations, major restaurants, hotels etc. If you want a lower rate and clear sound is not a factor, there are many Internet cafés offering International calling.
The main postal service in Phnom Penh is located on the corner of street 102 and 13, which is east of Wat Phnom Penh. From there, you can send parcels, telegrams etc. It opens daily from 7:30AM to 5:00PM
Government offices are open from 7:30AM to 5:00PM on weekday; the lunch break is from 12:00 to 2:00PM. Most businesses, restaurants open from 7:00AM to 8:00PM while most banks operate from 7:30AM to 3:30PM on weekday and some are half day on Saturday.
Note: For latest information and details, please check with your Travel Agent before you travel.