Sone523mp4 < 99% LATEST >

"Sone" could be a brand, maybe a typo or alternative spelling. Sometimes brands use different spellings in Japanese versus English. "523" is probably a model number or version. The "mp4" part is interesting. MP4 usually refers to the video format or a multimedia player, but in Japanese, "MP4" can sometimes mean "fourth generation mobile phone," which is a different standard.