A mobile device and a method for controlling the mobile device are provided. The mobile device includes a flexible display unit that has a first longitudinal edge and a second longitudinal edge and is configured to be wound in spiral turns and thereby to create at least two display regions with respect to a boundary between the first longitudinal edge in one turn and the second longitudinal edge in a next turn. The mobile device further includes a sensor unit configured to sense the boundary and to determine a display region, and a control unit configured to control the determined display region.