Hi,
00 is used as an exit international code by many countries in Europe and not only. In the US they use 011 instead. Are you saying that you could call VT from the USA using 00?
As for the second number – it’s hard to conclude where it is from. 852 is the country code for Hong Kong. However, the remaining digits are too few to form a regular phone number. Could be a special number. Or it is possible that, for some reason your phone doesn’t show the whole/correct number.