A basic 3d-printable model of the iDroid from Metal Gear Solid Vthis version is prepared to be used as a phone cover though it may need some scaling/stretching or modifications to fit your phone
STL (Stereolithography, filesize: 10.1 MB), OBJ (OBJ, filesize: 15.1 MB), SLDPRT (SolidWorks, filesize: 4.68 MB)