The ornamental design for a styluspen for a mobile device, as shown and described.
FIG. 1 is a perspective view of a stylus pen for a mobile device, showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a view showing an example of the usage of the stylus pen for a mobile device, wherein a leg of the stylus pen is inserted into an earphone jack of a mobile device.
The purpose of broken lines in the drawings is to show environmental structure or boundaries that form no part of the design to be patented.