Apple doubled the maximum iPhone storage space to 1TB this year, and it may do the same again next year. Per Chinese site My Drivers, the 2022 iPhone range, which we presume will be called the iPhone 14, will offer up to 2TB of storage.
This report follows a report from DigiTimes that said Apple is working with NAND flash chipmakers and aims to make cost-effective QLC (quad-level cell) NAND flash solutions for the iPhone 14.