This is part of our ‘On My Mobile’ series (RSS), a modest attempt to better understand how folks in Japan use their smartphones. We recently featured the very fun Domino’s x Hatsune Miku smartphone application, which imposes an amazing augmented reality musical performance from a virtual pop star over top of your pizza. The folks behind that app are none other than Kamakura-based development studio Kayac, the same crew behind fun ideas like the Voice Driver Cup. I thought it might be interesting to see how some people at Kayac use their own mobile phones, and Kayo Matsubara was kind enough to oblige. As you can see, she’s a big fan of Facebook (as many Japanese people are these days). She tells me she’s also using the Withings Health Mate app a lot these days too, as well as the Moves app to track her physical activity. She also points to the Japanese service Sumally as one she enjoys very much. This is a unique encyclopedia of things (as my colleague Yukari describes) — comparable to Gdgt.com in some ways. Below you can see an interactive view of her iPhone’s homescreen, and you can mousehover to get a peek at…