I have a Japanese friend whom I chat to from time to time on a software called Line.
Let's say their name is Haruto.
Sometimes I like to start by saying something like ''Haruto san, are you there ?''.
How would you say that in Japanese ?
I found the following phrases online but I have no idea what kind of nuance they carry. I'm just looking for a casual friend-to-friend way of expressing it.
Haruto san, soko ni imasu ka ?
Haruto san, iru ?