8 Things to Know About the iPhone Duo

Key points

• Apple's first folding smartphone, the iPhone Duo, has arrived, seven years after Samsung launched its Galaxy Fold. The Duo costs $1,999 and has a 5.4-inch outer screen and a 7.6-inch inner display.
• Many third-party apps are not yet optimised for the new shapes, and some Apple apps still show layout issues. The phone uses Touch ID instead of Face ID, and it supports MagSafe, though a magnetic wallet sticks out past the lower edge.
• Users can split the keyboard, create app pairs, and use the rear camera for selfies.