Well, it varies. Different mangas have different completion statuses. You need to specify the particular manga to get a precise answer. For instance, popular series like 'One Piece' is still in the midst of its story, but some lesser-known ones might have already wrapped up.
Sure, Yaoi manga is very real. It typically focuses on romantic and sexual relationships between male characters. These mangas are created and consumed by many people around the world.
There are indeed apps for manga reading. For example, MangaZone and Crunchyroll Manga provide access to various manga titles. However, the availability might depend on your region and device compatibility.
Well, determining if a real manga is out of print can be tricky. It often depends on its popularity, publisher decisions, and the demand in the market. Sometimes older or less popular titles might go out of print, but there's always a chance for reprints or digital releases.