I sometimes use USB tethering to connect my laptop to the Internet via my Fairphone 4. Sadly, an incoming call on the FP4 cuts off the Internet connection on my laptop. This happens even if I don’t accept the call.
What are some ways to prevent this annoyance? Ideally, the tethering to my laptop would be uninterrupted, but I’d still be able to tell if a call is incoming.
Is the USB connection cut off or does the connection speed drop to almost nothing?
In general the internet connection can only be held up if the phone doesn’t have to change the radio access technology for calling. This is where voice over LTE (VoLTE) or voice over 5G comes into play. If that is enabled the phone doesn’t have to switch to 2G or 3G for an incoming (or outgoing) call and vice versa.
So if the USB connection is still active but you don’t get any data through, then check the VoLTE settings. You could also try tethering via WiFi to see if that makes a difference.
Disclaimer: I usually use Wi-Fi tethering and have called and used data on my notebook at the same time successfully, but I have no experience with USB tethering.
I agree with you that enabling VoLTE (or 4G Calling) should solve the problem. But the preferred network type should not be 2G as in your second screenshot. 4G/3G/2G would be the right choice in this case.
my comment wasn’t meant as an offense. I’m supporting certain software in the circle of my colleagues and frequenty use screenshots to show the correct settings. But it happens that the colleagues take the whole settings inside the screenshot as mandatory. That’s why I made this remark.