Phone Vietnam from Thailand....calling codes

I am an expat living in Vietnam who will visit Thailand shorty to visit a friend.During my stay I will need to phone Vietnam...I have the Vietnam entry code which is 84 but I have read there are various Thailand exit do I figure out which one I use....I intend to buy a sim at DTAC Happy Tourist in the airport when I arrive.

I pretty sure DTAC will be happy to tell you which prefixes are best for international calls on their system.  Google would probably have the answer as well.  I use 009 on AIS but I am pretty sure they have other codes as well.

Thank you.

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