Are electrical outlets different in Vietnam?

I'm going to Vietnam and staying with family. I'm wondering if I'll be able to charge an iPhone with a regular two prong plug. I don't know anything about this, really.

Would I need a universal charger or anything?

Yes it is different!
You will need this thing to be able to charge your IPhone in Vietnam…

I moved to Vietnam from America and I still use the 2 prong factory charger that came with the phone from Apple. You don't need a universal charger

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