FIG. 1 is a perspective view of a cellphone plug adapter showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is the other side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in FIGS. 1, 2, and 3 are for illustrative purposes and form no part of the claimed design.