There are few arguments, which oppose this law. First, that the security problem will not be solved, because all criminals can buy pre-paid cards from the black market, which come from abroad and are sold freely. Besides this, many immigrants, who are living illegally in Greece, will have to buy pre-paid cell phones from the black market. All phone companies themselves, will have to change completely the way they function and to adapt sales networks, for which they will have to invest a lot of money.