We claim the ornamental design for a mobile phone, as shown and described.
FIG. 1 is a front perspective view of a mobile phone 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 top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a rear perspective view thereof.
The short dash-dash broken lines represent unclaimed portions of the mobile phone and the dot-dash broken lines define the bounds of the claimed design; the broken lines form no part of the claimed design.