Atm in Cambodia they just give not underder then 100 dollar you have to take 100 dollar not 50 or less every transaction 5 dollar's fee plus add your bank fee on top Cambodia is expensive place NOTHING to enjoy ( this is my opinion)
İ just come back 2 day ago you can use dollads everywhere there 1 dollar is 4100 riel if you give dollar they give you riel change some time dollar also Thai baht can use only in city in nearest border Cambodia is a place don't want to go second time :) turist visa 30 dollar bussines 35 dollar plus 100 baht they want for their poket I don't know why they ask extra 100 even there is write 30 dollar maybe they don't want from everyone:)