FIG. 1 is a bottom plan view of a back cover for a handset showing my new design;

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 top plan view thereof; and,

FIG. 6 is a perspective front view thereof.

The broken line showing of the internal surfaces and the extending tabs is for illustrative purposes only and forms no part of the claimed design.