The iPhone 15 Pro and iPhone 15 Pro Max will very likely be the only smartphones available this year powered by an application processor (AP) manufactured using the 3nm process node. The lower the process node, the smaller a chip’s feature set allowing more transistors to be employed. And the more transistors used in a chip, typically the more powerful and energy-efficient it is.
Most phone manufacturers are sitting out the first year of 3nm chip production thanks to high wafer costs
Keep in mind that only the iPhone 15 Pro models will be using the 3nm A17 Bionic this year. The iPhone 15 and iPhone 15 Plus will be powered by the hand-me-down A16 Bionic chipset. The iPhone 16 series should be the first to feature 3nm SoCs powering all four models.