FIG. 1 is a bottom plan view of first a embodiment of a bottom shell portion of a handset showing my new design with a disclaimed remainder of a handset for illustrative purposes;

FIG. 2 is a right side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a perspective front view thereof;

FIG. 7 is a perspective rear view thereof;

FIG. 8 is a bottom plan view of a second embodiment of a bottom shell portion of a handset showing my new design with illustrating a bottom shell of a handset in isolation;

FIG. 9 is a right side view thereof;

FIG. 10 is a front view thereof;

FIG. 11 is a left side view thereof;

FIG. 12 is a rear view thereof;

FIG. 13 is a perspective front view thereof; and,

FIG. 14 is a perspective rear view thereof.

The broken line showing in the FIGS. 1-7 showing the remainder of the handset and the broken line illustrations in FIGS 8-a1 showing unshaded inside surfaces of the bottom shell of a handset is for illustrative purposes only and forms no part of the claimed design.