Vietnam and Its Love of Numbers

My handy interpreter/fixer/assistant, Nhan, who also is my "left arm" (she corrected me when I called her my right arm, noting that I'm left-handed, and therefore to refer to her as my right arm would be calling her useless), informed me of the following:

The Vietnamese believe in numbers. Each number is assigned a positive property--1 might be Love. 2 is Prosperity,  3 might be wisdom, etc. (Note that I'm assigning random properties--I don't know what each number represents).

So Nhan told me that when she got her cell phone number, she held out for a good one (apparently, 9s are very good).

The downside of this is that strangers randomly call her, checking to see if the cell phone number is assigned. And when they find out it is, they ask if she's willing to sell it to them.