The ornamental design for a smart phoneholder of exterior add-on camera, as shown and described.
FIG. 1 is a perspective view of a smart phone holder of exterior add-on camera, showing my new design in a condition of operation;
FIG. 2 is a perspective view thereof, in an alternate condition of operation;
FIG. 3 is a front elevational view of a smart phone holder of exterior add-on camera without the unclaimed smart phone and camera;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is a perspective view thereof.
The broken lines in FIGS. 1 and 2 depict environmental subject matter, specifically a smart phone and camera that forms no part of the claimed design. The broken lines in FIGS. 3-9 depict portions of the smart phone holder that form no part of the claimed design.