Yes, a lot actually, in fact carriers here are infamous for offering phones even for free depending on the contract, resulting into one carrier once making a ad, saying that their bonuses for long term costumers were cash, because "paying" with phones was silly.
But the law says that if the costumer want to end his contract, then he will pay his fines or whatever, but the carrier must unlock the phone.
Also you see "unlocking stores" frequently on metro stations for example, it is perfectly legal, and encouraged by the government, to incentive some free market between carriers (here we have 4 big GSM carriers, some people even own prepaid GSM chips of all of them).
But the law says that if the costumer want to end his contract, then he will pay his fines or whatever, but the carrier must unlock the phone.
Also you see "unlocking stores" frequently on metro stations for example, it is perfectly legal, and encouraged by the government, to incentive some free market between carriers (here we have 4 big GSM carriers, some people even own prepaid GSM chips of all of them).