Numbers of Hanoi

If you have been to Hanoi then you have seen the numbers. Printed on walls throughout the city, from the main streets to the smallest alley, are countless phone numbers in multiple colours. They are advertising; numbers for people's businesses I have been told. I don't know the success but they are everywhere. I have heard and read that the goverment wants to get rid of the numbers. I hope they don't. The numbers give character to the city and in a way makes Hanoi, Hanoi.