The ornamental design for a wearablecellphoneholder, as shown and described.
FIG. 1 is a perspective view of a wearable cell phone holder;
FIG. 2 is a front view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a left view thereof;
FIG. 7 is a right view thereof; and,
FIG. 8 is a perspective view, showing the wearable cell phone holder in an alternate wrapped configuration.
The broken line showing hook-and-loop fasteners is included for the purpose of illustrating environmental structure and forms no part of the claimed design.