Earlier quoted context omitted.
When I'm in Japan and want to talk with my insurance company, bank, or airline over on the other side of the world, there's just one way: A phone number. Which is the (main) reason I'm still using Skype. There are other, and sometimes better, alternatives for video/chat/group chats/photos etc. But still nothing that competes with Skype's phone support, although Skype in general has degenerated a lot since the early d…
Is viber still around? I used to use that.
For ordinary chats, groups, video conversations, file / movie / photo / album sharing etc. I use Naver Line, as nearly every Japanese do as far as I can tell.