The ornamental design for telephone instrument, as shown and described.
FIG. 1 is a front, top and right side perspective view of a telephone
instrument showing my new design in cradled relationship;
FIG. 2 is a top plan view thereof;
FIG. 3 is a right side elevational view thereof, the left side elevational
view being substantially a mirror image thereof, except for the omission
of the three buttons; and
FIG. 4 is a rear elevational view thereof.
The bottom of the instrument is plain and unarrayed.