Not that difficult to do 10 digit mobile number. Just start with xxxxxxxxx1 and then xxxxxxxx2 etc etc a simple macro programme can run through the sequence quickly and add those numbers that return a hit as a friend!
Wonder how, if they do at all. donate money to charities or give to beggars in the street.
Will beggars be required to have contactless payment facilities or a bar/QR code to accept dinations!!!!????