If you want to make use of Calllock is there no cash, a card with value or any compulsory subscriptions needed. Users can operate the system via existing systems such as SMS, mobile internet, an APP, MIFARE and NFC. Calllock can be linked to mobile phones (equipped with NFC) and to existing MIFARE passes which the future users already have.
MIFARE
Mifare is the mostly used contactless chip in the world. The technique is used in more than one billion chip cards. In the Netherlands the MIFARE card is also used for the public transport cards and the citypasses.
NFC
NFC is a abbreviation of Near Field Communication and is a contactless communication method that uses high frequency at short distance. The technique was developped by Philips in cooperation with Sony and Nokia and is intended for use in mobile phones. The future phones will contain NFC and this will be the replacer of all the different MIFARE card that we own.