Make sure you buy it it is unlocked otherwise you will stuck with the carrier or just waste your money. So ask the seller to proof that it is unlocked by inserting a different sim card or unlock code they got.
or you can just buy a gsm phone that work with 900 or 1800 band, bring it to vietnam and 99% chance that you can get your phone unlocked at local store ( will need a little searching for a store that actually unlocking on the spot, not bringing your phone to other store to get it unlock ),
Unlocking at a phone store in vietnam should cost you less than $20.
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