Abstract: A two-piece bumperband and clamshell assembly for protecting a smartphone subhousing. The bumperband comprise an impact resistant band of material that encircles peripheral edges of the subhousing. The bumperband includes an inwardly facing groove or channel structure that enables the bumperband to clamp against either or both a display screen bezel of the subhousing and the stepped ridge on the edges of the subhousing. The bumperband may also include a raised screen bumper protruding above and to protect the surface of the display screen. A downwardly protruding perimeter flange of the bumper band forms a perimeter gap to frictionally receive an upwardly protruding lip extending around the perimeter a clamshell backing when press-fitted with the subhousing and bumperband.