When you think of Japanese smartphones, what usually comes to mind? Is it the sleek, almost futuristic designs? The top-tier cameras that capture every fleeting moment with stunning clarity? Or perhaps the quirky, often delightful, anime-themed limited editions that make collectors swoon? (If you’re nodding, you’re on the right track, but there’s a deeper, more charming layer to uncover.) Because if you look a little closer, if you really *listen* to what these devices are whispering, you'll discover something truly unique to Japan's mobile culture: the enduring appeal of what I like to call **“bonus gadget features.”** These aren't just your standard smartphone functions. Oh no. These are the fun, sometimes borderline whimsical, additions that hark back to a bygone era – the golden age of the classic Japanese flip-phone, or "keitai," from the early 2000s. To some, they might seem like relics, dusty old museum pieces of tech. But in Japan, these playful add-...