The ornamental design for a carphoneholder, as shown and described.
FIG. 1 is a front and top perspective view of a car phone holder, showing my new design;
FIG. 2 is a rear and bottom perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is another perspective view thereof, shown in a using position.
The broken lines in the figures illustrate portions of the car phone holder that form no, part of the claimed design. The broken lines of mobile phone in FIG. 9 shown in the drawings depict environmental structure that form no part of the claimed design.