We claim the ornamental design for a radio pager, as shown and described.
FIG. 1 is a top front perspective view of a radio pager showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom front perspective view thereof.
The broken lines shown in the drawings are included for the purpose of illustrating portions of the Radio Pager that form no part of the claimed design.