A mobile phone at least includes a first back cover, a second back cover and a main body. The first back cover has a first fastening part on its inner wall. The second back cover has a first interfering part on its inner wall. The first back cover and the second back cover are assembled with the main body. The main body has a resilient hook including a resilient arm, a second fastening part and a second interfering part. One end of the resilient arm is fixed to the main body, and the second fastening part is provided on the other end of the resilient arm. The second interfering part is provided on the resilient arm. When the second back cover is separated from the main body, the first interfering part pushes against the second interfering part to drive the second fastening part to separate from the first fastening part.