A biometric system comprising: a contactless smartcard including a biometric arrangement and wireless power transfer arrangement, an enrollment assistance device, for facilitating biometric enrollment of a user of the contactless smartcard, enrollment assistance device comprising: a carrier, provided in the form of a sheet, having a first surface portion for arrangement of a mobile phone including a wireless power transfer arrangement, and a second surface portion, spaced apart from the first surface portion, for arrangement of the contactless smartcard; a first wireless power transfer arrangement supported by the carrier and arranged to form a first wireless power transfer link with the wireless power transfer arrangement of the mobile phone when the mobile phone is arranged on the first surface portion of the carrier; a second wireless power transfer arrangement supported by the carrier and arranged to form a second wireless power transfer link with the wireless power transfer arrangement of the contactless smartcard when the contactless smartcard is arranged on the second surface portion of the carrier; and a conductor arrangement supported by the carrier and conductively connecting the first wireless power transfer arrangement and the second wireless power transfer arrangement, in such a way that power transfer is enabled from the mobile phone to the contactless smartcard, via the first wireless power transfer link, the conductor arrangement, and the second wireless power transfer link, wherein the carrier comprises written and/or graphical guidance printed on the carrier for guiding the user to correctly arrange the mobile phone on the first portion of the carrier, in relation to the first wireless power transfer arrangement; and wherein the contactless smartcard is arranged on the second surface portion of the carrier of the enrollment assistance device. a carrier, provided in the form of a sheet, having a first surface portion for arrangement of a mobile phone including a wireless power transfer arrangement, and a second surface portion, spaced apart from the first surface portion, for arrangement of the contactless smartcard; a first wireless power transfer arrangement supported by the carrier and arranged to form a first wireless power transfer link with the wireless power transfer arrangement of the mobile phone when the mobile phone is arranged on the first surface portion of the carrier; a second wireless power transfer arrangement supported by the carrier and arranged to form a second wireless power transfer link with the wireless power transfer arrangement of the contactless smartcard when the contactless smartcard is arranged on the second surface portion of the carrier; and a conductor arrangement supported by the carrier and conductively connecting the first wireless power transfer arrangement and the second wireless power transfer arrangement, in such a way that power transfer is enabled from the mobile phone to the contactless smartcard, via the first wireless power transfer link, the conductor arrangement, and the second wireless power transfer link, wherein the carrier comprises written and/or graphical guidance printed on the carrier for guiding the user to correctly arrange the mobile phone on the first portion of the carrier, in relation to the first wireless power transfer arrangement; and wherein the contactless smartcard is arranged on the second surface portion of the carrier of the enrollment assistance device.