Previously, some media reports said that Apple Intelligence (Apple Intelligence) only supports iPhone 15 Pro and above models and the entire iPhone 16 lineup, mainly because the RAM needs to be at least 8G, but the description of the storage space ROM is not disclosed.
Recently, iOS 18.1 Beta has been opened for testing, and in its official iPhone User Manual, it states that "iPhone devices require 4GB of storage space", and at the bottom of the document, it also states that "with the introduction of more features, the storage requirements for Apple Smart on the device will be further increased".
This means that people who don't have enough space on their 128G phones may need to get an iPhone with more storage if they want to use Apple Smart.