Apple’s standard iPhone 18 is reportedly missing two major iOS 27 features because of its limited 9GB of RAM. While the phone will support iOS 27, advanced AI-driven capabilities like an upgraded Siri and improved dictation will be exclusive to the Pro models and the foldable iPhone Ultra. The base model’s 9GB RAM can’t handle the new on-device Siri processing, which requires the 12GB found in higher-tier devices.
Leaks indicate Apple is limiting iOS 27’s local AI features on the regular iPhone 18 lineup. The first affected function is Siri’s enhanced voice customization-allowing users to pick more natural speech styles and control speaking pace. The second is an overhauled dictation system that processes longer sentences more accurately, improves punctuation, and reduces errors.
The base iPhone 18 and the iPhone 18e receive a modest RAM upgrade-from 8GB to 9GB. However, this slight increase isn’t sufficient for AI features that require at least 12GB of memory to run locally without relying on the cloud. For Apple, RAM size determines which smart assistant functionalities can operate entirely on the device.
By comparison, Apple’s Pro models and the new Ultra foldable phone come with 12GB of RAM, enabling them to run the latest local Siri and dictation improvements smoothly. This creates a disadvantage for the base iPhone 18 in the AI department, placing it behind flagship Android devices from Samsung and Google that already offer integrated on-device assistants with similar capabilities.
This differentiation highlights Apple’s strategy of reserving advanced AI features for its premium models, using hardware limitations to justify the tiered experience. As iOS 27 advances on-device processing, buyers of the standard iPhone 18 may find some promised features unavailable, encouraging them to choose pricier options for full AI benefits.
With memory constraints directly affecting which iOS 27 features are accessible, the gap between Apple’s standard and Pro lines could widen. Observers should watch whether Apple will adjust pricing or specifications next year, or develop software solutions to bridge this gap. Meanwhile, this move raises questions about how Apple balances hardware requirements with user expectations in an increasingly AI-driven smartphone market.