According to a first aspect of the present disclosure, a mobile device for facilitating a transaction is provided, comprising: a secure element configured to contain transaction-related data; an ultra-wideband radio unit operatively coupled to the secure element and configured to carry out ultra-wideband radio communication with an external reader; wherein the ultra-wideband radio unit is configured to operate as an interface between the secure element and said external reader. According to a second aspect of the present disclosure, a reader for facilitating a transaction is provided, comprising: an ultra-wideband communication and tracking unit configured to communicate with at least one external mobile device having an ultra-wideband radio unit and to track said mobile device; a processing unit operatively coupled to the ultra-wideband communication and tracking unit, said processing unit being configured to process at least one transaction. According to a third aspect of the present disclosure, a corresponding method for facilitating a transaction using a reader is conceived. According to a fourth aspect of the present disclosure, a corresponding computer program is provided.