The ornamental design for a mobile phonecase, as shown and described.
FIG. 1 is a front perspective view of a mobile phone case 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 plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a front elevation view thereof shown in a state of use with environmental symbols and text visible through the openings of the case;
FIG. 9 is a front elevation view thereof shown in a state of use with environmental symbols visible through the openings of the case; and,
FIG. 10 is a front elevation view thereof shown in a state of use with environmental numbers, text, and symbols visible through the openings of the case.
The dashed broken lines depict portions of the mobile phone case and environmental symbols, numbers, and text that form no part of the claimed design. The dot-dash broken lines represent the bounds of the claimed design and form no part thereof.