A device comprising: a housing; a roll unit mounted in the housing and configured to be rotatable around a roll axis; a flexible, touch-sensitive display configured to detect a touch gesture and to be rolled around said roll unit and thereby define a planar front screen with a front screen size that changes according to a degree of rotation of said roll unit; and a controller configured to, in response to detecting a touch gesture on the front screen, cause a rotation of said roll unit to adjust said front screen size, wherein said touch gesture comprises a sliding movement of a plurality of touch inputs detected simultaneously or in immediate sequence with respect to each other on said front screen in a same direction, wherein said front screen comprises a first edge arranged parallel with and adjacent to said roll unit and a second edge arranged opposite to said first edge, wherein said front screen is configured to be adjusted by said controller between a rolled-in state wherein said front screen size is minimal, and a rolled-out state wherein said front screen size is maximal; wherein the controller is further configured to in response to detecting a said sliding movement in a direction from said first edge towards said second edge, adjust said front screen to a rolled-out state, and in response to detecting a said sliding movement in a direction from said second edge towards said first edge, adjust said front screen to a rolled-in state; the device being characterized in that said controller is further configured to: detect a speed S of said sliding movement on said front screen, and adjust a speed of rotation Sr of said roll unit and thereby a roll-in speed or roll-out speed of said display in accordance with said detected speed S of said sliding movement. a housing; a roll unit mounted in the housing and configured to be rotatable around a roll axis; a flexible, touch-sensitive display configured to detect a touch gesture and to be rolled around said roll unit and thereby define a planar front screen with a front screen size that changes according to a degree of rotation of said roll unit; and a controller configured to, in response to detecting a touch gesture on the front screen, cause a rotation of said roll unit to adjust said front screen size, wherein said touch gesture comprises a sliding movement of a plurality of touch inputs detected simultaneously or in immediate sequence with respect to each other on said front screen in a same direction, wherein said front screen comprises a first edge arranged parallel with and adjacent to said roll unit and a second edge arranged opposite to said first edge, wherein said front screen is configured to be adjusted by said controller between a rolled-in state wherein said front screen size is minimal, and a rolled-out state wherein said front screen size is maximal; wherein the controller is further configured to in response to detecting a said sliding movement in a direction from said first edge towards said second edge, adjust said front screen to a rolled-out state, and in response to detecting a said sliding movement in a direction from said second edge towards said first edge, adjust said front screen to a rolled-in state; the device being characterized in that said controller is further configured to: detect a speed S of said sliding movement on said front screen, and adjust a speed of rotation Sr of said roll unit and thereby a roll-in speed or roll-out speed of said display in accordance with said detected speed S of said sliding movement. in response to detecting a said sliding movement in a direction from said first edge towards said second edge, adjust said front screen to a rolled-out state, and in response to detecting a said sliding movement in a direction from said second edge towards said first edge, adjust said front screen to a rolled-in state; the device being characterized in that said controller is further configured to: detect a speed S of said sliding movement on said front screen, and adjust a speed of rotation Sr of said roll unit and thereby a roll-in speed or roll-out speed of said display in accordance with said detected speed S of said sliding movement. detect a speed S of said sliding movement on said front screen, and adjust a speed of rotation Sr of said roll unit and thereby a roll-in speed or roll-out speed of said display in accordance with said detected speed S of said sliding movement.