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The iPhone Fold is reported to use a titanium frame and generally "very premium build materials." Samsung’s Galaxy Z Fold 8 may move away from a titanium backplate, with reports saying the Fold 8 could be downgraded from a titanium backplate (see related article "Samsung's next-gen Galaxy Z Fold 8 could get downgraded from titanium backplate in 2026"). Answered

Flex Titanium is a new foldable-display technology Samsung will use in the Galaxy Z Fold 8 that combines a titanium-alloy film beneath the OLED panel with a micro-patterned titanium plate below that to eliminate air gaps at the fold. The titanium-alloy film offers 20 times greater mechanical stiffness than the polymer films used in previous designs while measuring less than 30 percent the thickness of a human hair, and the micro-patterned titanium plate provides flexible support at the hinge and reduces air gaps for a flatter open display. Answered

The primary article says Flex Titanium is confirmed for the Galaxy Z Fold 8 and that the technology could eventually make its way to other devices, naming a likely candidate as Apple’s long-rumored foldable iPhone because Samsung Display reportedly secured a three-year exclusive deal to supply its displays. Related coverage (“Samsung Display producing even more foldable OLED panels, ready for Apple’s foldable iPhones”) also notes Samsung Display is increasing production capacity for foldable panels for Apple, suggesting availability to other manufacturers is possible. Answered