Calling from US to vietnam?

Question

I don't know how to call to vietnam from the US. I need to call a friend there. What do I dial to call her cell phone?

Answer 1

but you drop the 1st 0 in the number +849xxxxxxxxx, not +8409xxxxxxxxxx

Answer 2

Dial 011 84 + local number. Omit prefix 0 , if there is one.

Answer 3

vietnam country code (84)followed by the cellphone number.

+84 - x*x x*x xxxx where x*x x*x xxxx is the cellphone number