Abstract: An adjustable support for supporting an electronic device includes a first, a second and a third frame rotatably connected to two end portions of the first frame. Each frame includes a number of sliding limit structures on one surface of the frame. The frames are configurable into at least the following positions: a first position in which the first and second frames are flat and the third frame is at a non-zero angle to the first frame, and a second position in which the first and the third frames are flat and the second frame is at a non-zero angle to the first frame. One of the flat frames supports the lower edge of the electronic device with a selected sliding limit structure of the flat frames stopping the lower edge of the electronic device, and the standing frame acts as a back stand for the electronic device.