When the Ringover application is run in the background on some phones, a setting must be made in the Ringover application to allow calls to be received 📱. Otherwise, by default, the phone blocks the data.
Go to the ⚙️ settings on your phone.
Select "Mobile Data Networks", "Mobile Data" and then "Mobile Data Roaming". 📶
Go to "Settings", "Applications" then select "Ringover" and allow all notifications.
Disable "Automatically managed application launch" and enable the 3 options displayed below ✅.