I claim the ornamental design for a smartphone container, as shown and described.
FIG. 1 is a top right front perspective view of a smartphone container.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a rear elevational view thereof.
FIG. 4 is a right side elevational view thereof, the left side elevational view being a mirror image thereof.
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The shading lines shown in the drawings represent the approximate three-dimensional contour of the design, and are not intended to indicate surface decoration.
In the drawings, the broken lines depict unclaimed subject matter only and form no part of the claimed design.