The ornamental design for a mobile phonemagneticstand, as shown and described.
FIG. 1 is a first perspective view of a mobile phone magnetic stand showing my new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a third perspective view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right side view thereof;
FIG. 8 is a top view thereof;
FIG. 9 is a bottom view thereof; and,
FIG. 10 is an enlarged view of the selected portion 10 in FIG. 1.
The dot-dash broken lines encircling the area of the detail in FIG. 1 and surrounding FIG. 10 denote the boundary of the enlarged detail and form no part of the claimed design.