The ornamental design for portable information terminal, as shown and described.
1.-2. Portable information terminal
1.1 : Perspective
1.2 : Perspective
1.3 : Perspective view showing changed state
1.4 : Perspective view showing changed state
1.5 : Front
1.6 : Back
1.7 : Right
1.8 : Left
1.9 : Top
1.10 : Bottom
Each of design 1 is a portable information terminal functioning as a computer, a media reproducing device (e.g. a musical player, a video player, a game machine), a media storage device, a communication equipment (e.eg. a mobile phone), etc.; the portable information terminal comprises connected first to third housing and a flexible display portion supported by the first to third housings; the two-folded state, the unfolded state, or the state bent in an arbitrary shape, as seen in the reproductions 1.1 to 1.11.