Apple's iPhone Duo silicone case uses adhesive to attach

Apple's $79 official silicone case for the iPhone Duo requires its internal adhesive to be exposed to stay attached, according to users of early iPhone Duo units.

Users who bought the $79 silicone case report the adhesive must be exposed on the inside before installing the case.

They say the case will fall off easily if the adhesive is not used and will not remain attached to the phone otherwise.

Parker Ortolani (@ParkerOrtolani) tweeted "both sides too" and linked to an image on October 16, 2026 illustrating the adhesive detail.

Reports indicate this is the first Apple case reported to rely on internal adhesive rather than magnets to hold in place.

Apple also offers a $129 folio case as an alternative, and third-party cases that do not require adhesive are available.

Buyers who change cases frequently or prefer to go caseless should consider the folio or third-party options before purchasing the silicone case.