The ornamental design for a holder for a mobiledevice, as shown and described.
FIG. 1 is a front right perspective view of a holder for a mobile device according to the present invention.
FIG. 2 is a rear left perspective view of the holder for a mobile device of FIG. 1.
FIG. 3 is a left side of the holder for a mobile device of FIG. 1.
FIG. 4 is a right side view of the holder for a mobile device of FIG. 1.
FIG. 5 is a front side view of the holder for a mobile device of FIG. 1.
FIG. 6 is a bottom view of the holder for a mobile device of FIG. 1.
FIG. 7 is a top view of the holder for a mobile device of FIG. 1; and,
FIG. 8 is a rear view of the holder for a mobile device of FIG. 1.
The dashed lines illustrate environment that does not form a part of the present invention, and no claim is made to the material illustrated with dashed lines.