FIG. 1 is a perspective view showing my new design for a portable telephone in an opened position, the broken line matter being for illustrative purposes only;

FIG. 2 is a left side elevational view thereof in an opened position, the broken line matter being for illustrative purposes only;

FIG. 3 is a rear elevational view thereof in an opened position, the broken line matter being for illustrative purposes only;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a perspective view thereof in a closed position, the broken line matter being for illustrative purposes only.

The broken line disclosure throughout the views forms no part of the claimed design.