The OS expected to come preinstalled on Apple's foldable iPhone Duo is iOS27.1, which is expected to be released between October 20 and 22. Japanese-language support for Siri AI is also highly likely to launch around the same time.
A note in a press release indicates that the iPhone Duo will come with iOS27.1 preinstalled. The release is scheduled for October 23, and iOS is expected to be released ahead of the launch, around October 20-22.
The “.1” updates that follow major fall OS releases are reportedly typically rolled out around early November, but iOS27.1 is expected to arrive earlier to coincide with the iPhone Duo announcement.
The official announcement states that the multilingual rollout, including Japanese-language support for Siri AI, will begin in October, making it highly likely that it will overlap with the release of iOS27.1.
The iPhone Duo is expected to feature new UI optimizations designed around its dual-screen configuration, and reports indicate that integration of the hardware, software and Japanese-language AI experience is progressing.