FIG. 1 is a top plan view of the cell phone holder; FIG. 2 is a bottom plan view of the cell phone holder; FIG. 3 is a side elevational view (left side) of the cell phone holder; FIG. 4 is a front elevational view of the cell phone holder; FIG. 5 is a side elevational view (right side) of the cell phone holder; and, FIG. 6 is a rear elevational view of the cell phone holder. The broken line showing of environment in FIG. 3 is for illustrative purposes only and forms no part of the claimed design.