iPhone 18 Pro’s Third Live Activity Has a System-Only Catch

Apple’s Three-Activity Limit

Apple’s iPhone 18 Pro models could support up to three simultaneous Live Activities in iOS 27, but the third slot reportedly comes with a significant limitation: it may be reserved for a system activity rather than being available to any app.

The detail was noted by code explorer pdfu and shared through the MacRumors forums. According to the report, Apple slimmed down the cutout associated with the Dynamic Island on iPhone 18 Pro models, creating room for the interface to display an additional Live Activity.

The Catch for iPhone 18 Pro Owners

That change does not appear to mean users will be able to run three independent app-based Live Activities at once. The third Live Activity in iOS 27 is said to be limited to a system activity, while the exact behavior of the other two slots was not detailed in the available report.

In practice, the distinction matters because Live Activities are designed to surface ongoing information from apps directly on the Lock Screen and Dynamic Island. A higher display capacity sounds useful, but a system-only third activity would make the feature more constrained than the headline number suggests.

What the Report Establishes

The report points to a hardware and software connection: the smaller Dynamic Island cutout on the iPhone 18 Pro could enable additional Live Activity support, while iOS 27 reportedly determines how that extra space can be used. It does not establish which system activity would occupy the third position or whether Apple could change the behavior before release.

Because the information comes from a forum post and concerns unreleased iPhone 18 Pro models and software, it should be treated as a rumor rather than a confirmed feature. Apple has not been cited as confirming the three-activity capability or the system-only restriction in the available context.

Source: MacRumors Forums