As per previous post, I'm going to Thailand, Cambodia, Laos and Vietnam for 3 months. A few Q's.
(1) Where is best to change money in Laos / Vietnam and Cambodia? Should I bring travellers cheques or use my credit card out there to buy local currency?
(2) Should I buy a mosquito net before I travel over next week? I think you can get one on Amazon for like £18.
(3) I will be buying a Thai sim card most probably depending on cost. Should I take a UK unlocked phoned so I can put the sim into it?
(4) I've heard that at night time you will get bitten a lot by the mosquitos. I think jeans may get a little hot so is worth buying a couple of pairs of linen trousers? What is Thailand (Phuket) like for clothes?
Any help will be appreciated.
There are plenty of ATMs in Vietnam; less so in Cambodia and Laos. Travellers' cheques are a pain to change so I would definitely just use your card. Also take some US$ cash with you as this is widely used in the countries you are visiting, especially for larger amounts like accommodation. The local currency can be used for smaller amounts such as bottles of water.
I wouldn't bother with a mosquito net - in most places there won't be anywhere to hang it, so I'd buy one of the plug-in repellent devices. They are really effective and can be found easily in supermarkets across Asia, especially Thailand.
Jeans will be too hot in Asia so linen trousers would be a good idea. I seem to remember there were some market stalls in Phuket where I bought a linen top from so you shouldn't have too many issues finding some over there.
I'm not sure about the sim card.
No mosquito net unless you plan on sleeping in tents or really crappy places with open windows. When you are in a hotel with A/C on you have the windows shut anyway.
For Thailand you use their currency so you must change money over to Thai baht. In Thailand changing travelers checks is no problem at all - other countries not as easy. If you bring travelers checks for Thailand only bring the largest denominations you can get. There is a fee of 33 baht to cash a TC so don't waste fees on low value checks. For Thailand you have a fee of 150 baht per ATM withdrawal so don't take out small withdrawals with big fees!
For small cheap purchases and meals in restaurants I prefer to use cash. Using cash lessens your chance of credit card fraud. If you do use a credit or debit card overseas you must notify your bank that you will be out of the country first. If you do not your ATM withdrawals may be denied because of suspected fraud.
US dollars are a de facto currency in Vietnam and Cambodia but you should change some money to their currencies for cheap purchases. Do not leave Vietnam or Cambodia with their money because it is very difficult to change it in other countries.
Lots of internet shops available for you to check emails and communicate back home.