FIG. 1 is a perspective view of a one piece swivel belt clip for a cellular telephone, showing my design. FIG. 2 is a front elevational view; FIG. 3 is a rear elevational view; FIG. 4 is a left side elevational view, the right side view being a mirror image thereof; FIG. 5 is a top plan view; and, FIG. 6 is a bottom plan view.