The proximity sensor is turned on and teh screen goes black when you hold the device close to your ear in order to avoid misoperating the app.
You cannot disable the feature during a call.
If you want to keep the screen lit up during a call, check where the snsor is on your device and be careful not to cover the sensor with your face or hand.
In iOS, the proximity sensor turns disabled while you are talking with the speaker ON or making a video call, and the screen doesn't turn black.
Note: App version 1.7.15 or later for iOS supports the above.
<SkyPhone User Support Holiday Closing>
The SkyPhone User Support will be closed during the following time due to Japanese national holidays as Golden Week.
Holiday Closing Time: From Saturday, April 26, 2025 To Tuesday, May 6, 2025 (JST)
Unavailable Services: User support services (including our responses to your inquiries)
Please note that you'll be responded on May 7 (JST) or later if you contact us after 1:00 PM on April 25 (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