his credit history will be f***ed up but i dont think it will affect his visa status or anything.. the only thing is in future if he decides to live in usa.. his life will be hell.. cant rent apartment, cant get cell phone, cant get car loans..  he;ll have to pay everything in cash. and he will probably get ton of calls/ letters telling him pay.. and probably also get sued. but if he is not in usa, nothing to worry abt.. just chill