Electronic pickpockets are the new wave in criminals that will skim your personal details from your credit cards, debit cards, passports any any other RFID (Radio Frequency Identification) enabled devices that are on the frequency they are skimming.
The frequency most commonly used for contact-less devices is13.56 MHz and is used to transmit from your ‘Tap & Go’ credit cards or passports to a RFID reader trying to interrogate your cards or passports for personal data.