The ornamental design for a portablephone, as shown and described.
FIG. 1 is a perspective view of a portable phone;
FIG. 2 is a front view of the portable phone of FIG. 1;
FIG. 3 is a rear view of the portable phone of FIG. 1;
FIG. 4 is a left-side view of the portable phone of FIG. 1;
FIG. 5 is a right-side view of the portable phone of FIG. 1;
FIG. 6 is a top plan view of the portable phone of FIG. 1; and,
FIG. 7 is a bottom plan view of the portable phone of FIG. 1.
The dotted lines forming the arrow features near the center of the portable phone in FIGS. 1 and 2 represent the actual appearance of these arrow features and are part of the claimed design.