Even if your connection quality is good enough, the trouble on the line between you and the other person can deteriorate the connectivity.
It can be unstable because of the call quality setting on the other end.
[Maintenance Notice]
We will have a server maintenance during the following time. The SkyPhone service will be available, but the maintenance might cause instability in the service during the time.
We are very sorry for any inconvenience this may cause you and appreciate your understanding.
Maintenance Period: Tuesday, June 23, 2026, 9:00 am – 12:00 noon (JST)