iPhone Duo test criteria
Until we get our hands on the actual iPhone Duo to test each case with, we’ve used an incredibly accurate test-surrogate iPhone Duo to fit in the cases we’ve tested ourselves. We look for eight key criteria in each case.
Simon Jary
Protection: We checked corner reinforcement, camera and screen-edge protection, hinge coverage, and how much of the handset each shell covers. We did not run our own drop tests, so protection assessments are based on construction and coverage, and we note manufacturer claims as claims. Some case makers specify the exact measurements of their raised screen and camera edges, other do not.
Materials and grip: We assess surface texture, grip, finish, and visible fingerprint marks during handling. Common case materials include TPU (thermoplastic polyurethane, a flexible, durable plastic) and aramid fiber (a lightweight, high-strength synthetic fiber, best known through the Kevlar brand). The material alone does not establish how well a case protects the phone; construction and coverage also matter. Long-term wear, discoloration, and adhesive durability cannot be established during these initial checks.
Hinge protection and operation: Cases take different approaches to the Duo’s hinge: some include a protective cover, while others leave it exposed. We opened and closed each case on the dummy handset, checking for stiffness, rattling, gaps, and smooth movement of any hinge cover. We also checked whether both shells stayed firmly attached during opening and closing. These checks provide an initial assessment of the case’s construction and movement. We will assess the effect on the actual phone’s hinge movement or opening angle will require further testing with a working iPhone Duo.
Fit and installation: We used the dummy iPhone Duo to assess how securely each section fits the handset, the alignment of cutouts, and the ease of installation. We also checked the positioning and accessibility of button covers and port openings. Final fit and tolerances, button response, Touch ID operation, and cable fit will need confirmation with a retail iPhone Duo.
Slimness: The Duo’s thin profile is part of its appeal but this must be weighed against the backplate’s coverage and reinforcement. We penalize cases that add bulk without a clear benefit, but not where the protective benefits are worthwhile.
