FIG. 1 is an isometric view showing the new design for a case for a mobile phone;

FIG. 2 is an exploded view of the case for a mobile phone;

FIG. 3 is a front view of the case for a mobile phone;

FIG. 4 is a back view of the case for a mobile phone;

FIG. 5 is a left side view of the case for a mobile phone;

FIG. 6 is a right side view of the case for a mobile phone;

FIG. 7 is a top view of the case for a mobile phone; and,

FIG. 8 is a bottom view of the case for a mobile phone.

The broken lines in the drawing figures are for the purpose of illustrating a mobile phone that forms no part of the claimed design.