First - before even a toothbrush or water or anything - a phone - by definition the newest most fashionable phone - one which will be mentioned in the first sentence of every subsequent conversation with friends and family back home - in this case an iPhone5 (the ultimate in the Khmer mind right now - tried to persuade her into a Galaxy S3 - to make her's the same as mine - technological homogeneity being a good thing - but no luck - had to be "eyeponefi")- then second most important is Skype and a calling card - I swear a call was made to at least 60% of the entire population of Cambodia on the first evening - yet with that combination it cost me <$3