The invention relates to a SIM (2) card in a first format, with an electronic module (4). The card body comprises a score line (6) surrounding the electronic module (4) in order to define the second card format (3). The said score line (6), comprises residual matter thickness that is smaller than the thickness of the card body. The thickness of the residual matter comprises a first thickness (9) over a first part of the score line (6), at least one second thickness (10) smaller than the first thickness (9) over a second part of the score line and at least one residual thickness change zone (11, 17), where the said thickness change zone is a gradual thickness change zone (11, 17) that goes from the first thickness to the second thickness.