Automatic rotation of display contents of a hand held companion device ridgidly attached to a handheld mobile device

The present invention is notably directed to a handheld companion device (10), comprising: a screen (19); rigid physical connection means (13), adapted for rigidly attaching the companion device to a mobile device (20); communication means (13, 13a, 14), adapted for setting up and supporting one or more communication links with one or more external computerized systems (20, 30); and a memory (16), storing computerized methods (162), which are adapted, upon execution at the companion device, for: cooperating (S28, S30) with said communication means to set up said one or more communication links and receive orientation data (α, γ) of the mobile device (20) and contents, from said one or more external computerized systems (20, 30), via said one or more communication links; and re-arranging and displaying (S70) said contents on said screen according to said orientation data (α, γ). The present invention is further directed to related systems and methods for automatically rotating contents displayed on such devices, when rigidly attached on a handheld mobile device.