The ornamental design for a case for mobilephone, as shown and described.
Case for mobile phone
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Right
1.6 : Top
1.7 : Bottom
1.8 : Perspective
1.9 : Enlarged
The broken lines are for illustrative purposes only and form no part of the claimed design. The dotted lines in the drawings depict the boundary of the claimed design and form no part thereof.