The ornamental design for a portableinformationterminal, as shown and described.
FIG. 1 is a rear, top, right perspective view of a portable information terminal showing my new design;
FIG. 2 is a rear, bottom, left perspective view thereof; and,
FIG. 3 is a rear elevational view thereof.
Portions in broken lines are for illustrative purposes only and form no part of the claimed design. Dot-dash broken lines define the boundaries of, but not included in, the claimed design.