The ornamental design for a mobile phonecase, as shown and described.
FIG. 1 is a top, front and right side perspective view of a mobile phone case showing my new design;
FIG. 2 is a bottom, rear and left side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is an enlarged view of portion 9 in FIG. 1.
The dash-dash broken lines in the drawings illustrate portions of the mobile phone case which form no part of the claimed design. The dot-dash broken lines in FIGS. 1 and 9 are included for the purpose of delineating the portion included in the enlarged detail view and form no part of the claimed design.