What action can you perform to access more features while on a call?

Accessing the Message option while on a call allows for multitasking, enabling you to send or receive messages without disconnecting from the call. This feature is particularly useful for maintaining communication and sharing information simultaneously, enhancing the overall user experience during a conversation.

In contrast, switching to Speaker Mode enhances audio output but does not provide additional features for multitasking. Activating the Shortcuts app or enabling Backup before answering are also unrelated to call features, as they do not directly improve or expand the capabilities available while in a call. Thus, utilizing the Message option is the best choice for accessing more features during a call.