Indonesia’s government this week started enforcing a new rule requiring customers to show an official ID to purchase a prepaid SIM card.

The new regulation went into force last year, but the government extended the deadline to this year to give operators more time to prepare implementation, the Jakarta Post reported. The rule is intended to prevent the misuse of telecoms services and identity fraud.

Customers can present their national identity card, student card, driver’s licence or passport.

The newspaper said that the country’s two largest operators, Telkomsel and Indosat, are now ready to comply “technically and administratively” with the regulation.

Customers’ ID information will be stored in operators’ databases in a partnership with the Home Ministry that is still being worked out.