In most countries, callback services inhabit a gray area. Saudi Arabia and Kenya occasionally run ads reminding their people that callback is illegal, but they don’t try to enforce the law. China has better luck with enforcement because of its system of informants, but it doesn’t bother Western businesspeople, who are the primary users. Singapore has legalized them on the condition that they don’t advertise. In Italy, the market is so open that ITL is about to market a debit card that enables people to use the service from any pay phone.
