https://github.com/ylechelle/OpenUDID/blob/master/README.md
Or just read the MAC address: http://stackoverflow.com/questions/677530/how-can-i-programm...
> Google does just fine without a globally unique "advertising number". It can do so because people get actual value for the advertisements, and the advertisements are targeted.
I don't understand, can you elaborate? How can advertisements be targeted without tracking?