US dollars are as commonly used as the Cambodian Riel and even
Thai Baht is acceptable in many places. Most hotels and many restaurants and shops set their prices in dollars. Small transactions
are usually done in Riel. Always carry some small Riel for motorcycle taxis, snacks, beggars and other small purchases.
Riel notes come in 50, 100, 200, 500, 1000, 5000, 10,000, 50,000
and 100,000 denominations, but the distinctive red 500 Riel note is the most commonly used.
Credit cards are generally accepted at major hotels, shops, and
banks.
There are banks in all of the larger provincial capitals, including
Phnom
Penh, Siem Reap, Sihanoukville, and Battambang.
ATMs are relatively new in Cambodia,
however there are now a number in Phnom Penh and Siem Reap
which accept international cards. All money dispensed is in US dollars.