Where to use it?== 
 To check into a hotel... 
 To do banking transactions, after changing to use this form of ID... 
 As ID to get a mobile phone in repressive regimes, (Greece)... 
 To buy a car, a boat, and (hopefully) some land... 

 Sure to find more uses soon, other than travel 
 Maybe we should have a (talk/article?) section for (non-state) services that do and do not recognise it? 
    

 ==