I claim the ornamental design for a mobile phone, as shown and described.
FIG. 1 is a front perspective view of a mobile phone of the present invention;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof, the left side view being a mirror image thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a rear perspective view thereof; and,
FIG. 8 is a front view thereof shown with the display portion in a rotated position.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design and form no part of the claimed design. The remaining broken lines showing the mobile phone illustrate environment that forms no part of the claimed design.