Been out in Japan for ages ... well, since May lol ...
Features
* Comes with Hiiro no Kakera – Ano sora no shita.
* You are offered the option to change Tamaki's name the first instance you turned on the game
* The DS version comes with more scenarios, such as the Christmas date and mini games...
Use really old phones, and you can do it in 10 minutes ...
Use like those old giant brick phones, from the late 80s/early 90s ...
But yeah, you can't do it with modern phones ... not unless you keep the call going for hours ...