Apple is rumored to be working on a foldable iPhone that will stand out in the market.The foldable iPhone is expected to have a 7.8-inch main display when unfolded and a 5.5-inch cover display.To improve durability, Apple plans to use liquid metal in the hinges of the foldable iPhone.The foldable iPhone is anticipated to be one of the slimmest foldable smartphones on the market, measuring just 4.5mm when unfolded.