If the speed is over 64 kbps, there will be no problem for voice calls.
However if it is under 64 kbps, the performance can be deteriorated.
Note: As for video calling, we recommend that you use Wi-Fi.
<SkyPhone User Support Autumn Holiday Closing>
The SkyPhone User Support will be closed during the following time.
Holiday Closing Time: From Friday, September 12, 2025 To Tuesday, September 23, 2025 (JST)
Unavailable Services: User support services (including our responses to your inquiries)
Please note that you'll be responded on September 24 (JST) or later if you contact us after 1:00 PM on September 11 (JST).
You can continue using SkyPhone as usual while our user support services are unavailable.
Thank you for your understanding and cooperation.
If you need our support, click here to contact us.
SkyPhone User Support
Business hours to reply to your message: Monday to Friday 10:00 AM to 5:00 PM (JST), except for national holidays