Near field communication (NFC) allows contactless data transfer between mobile devices and NFC tags through electromagnetic radio fields. NFC tags contain antennas that can transmit up to 1MB of data when tapped by an NFC enabled device. The use of NFC is growing for purposes like mobile payments, accessing information by tapping smart posters and product packaging, and other marketing opportunities. By 2014, 20% of mobile phones were projected to have NFC capabilities, and mobile payment transactions using NFC were estimated to reach $74 billion by 2015.