Unknowns have hacked the NFC based electronic payment system used in Chile, the Tarjeta BIP!s, spreading an Android hack that allows users to re-charge cards for free. In Chile NFC electronic payment is already a reality, the payment system is used to pay for public transportation with users smartphones that support the standard. The authors of the fraud are also able to change the card identifier, called nmero BIP – a feature that makes hard for law enforcement to block illegally refilled BIP cards.”]
Source: http://securityaffairs.co/wordpress/29491/cyber-crime/chile-nfc-ticketing-hacked.html