External keyboard required. Keynote keyboard shortcuts on iPhone only activate with a physical keyboard connected.
Command modifier. Keynote on iPhone uses Command (⌘) when a Bluetooth keyboard is connected, following iOS conventions.
Slide navigation. Moving between slides in the navigator and navigating during a presentation are keyboard-accessible on iPhone.
Presentation delivery. Starting and advancing through a slideshow, going back, and ending the presentation can be done with an external keyboard connected to iPhone.
Object editing. Advanced object manipulation is primarily touch-driven on iPhone. Keyboard shortcut coverage for object editing is more limited than on iPad or Mac.
Discovering shortcuts. Holding Command on a connected keyboard in Keynote for iOS shows the available shortcuts for the current context.