Tim Cook dinner has verified nowadays the discharge of iOS 5.1, which will include Japanese support for Siri. Apple's presentation in full swing. The update is therefore not yet available, but will within the next few hours probably will be.
You can install iOS 5.1 later today through your iPhone to connect to a computer, in iTunes select your iPhone and then on "Search for Update" button. Since iOS 5 is also possible to install an iOS update from the settings screen of the iPhone, but chances are that this update method only a few hours later will work.
It is not yet clear what new features will include all iOS 5.1. In an earlier test version of IOS 5.1 4S iPhone users discovered that the 3G switch had returned in the settings screen. Siri from IOS 5.1 will be the Japanese language support, but this functionality will be rolled out only after several weeks.
The battery problems many iPhone users are plagued by, began shortly after 5 iOS released.
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