Portable telephone amplifier unit

The ornamental design for a portable telephone amplifier unit, as shown and described.

FIG. 1 is a left side, top and front perspective view of a portable telephone amplifier unit showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a back elevational view thereof;

FIGS. 5 and 6 are respectively top and bottom plan views thereof; and,

FIG. 7 is a left side elevational view thereof.

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