bringing cell phone from USA to Vietnam

Which model Iphone 6 will work in Vietnam if I buy it in the USA?

Both (iPhone 6 and 6 plus) will work just fine.  If it takes a sim card then everything is all good here.  Just a helpful tip, when they install the sim card, have them turn off the built in ads.  It's not a virus, but it randomly gives you ad pop ups and just gets annoying.

first you would need to have it unlocked then you can use any sim of your choosing.

Stay away from CDMA networks, get a GSM phone. AFAIK, AT&T and T-Mobile use GSM.

Apologies, I just learned that modern phones can handle both standards. My bad.

Cloud9 :

first you would need to have it unlocked then you can use any sim of your choosing.

Right so if your iphone is still under a plan, like if you bought it for about $300 with a 2 year contract, you need to pay off the contract first. And if it is already out of contract, you have to visit your carrier (Verizon or ?) and get them to 'unlock' it in their computer system.
How to unlock your iPhone

Just another note, if you are only 1 or 2 iPhones a laptop, and an tablet with you then there will be no problem with Vietnamese Custom at the airport. But if you have a bunch of brand new electronics with you then there will be a problem since Vietnam Custom do check incoming luggages

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