Usually phones have some components that are shared for different connection bearers. Some phones can do both voice calls and internet traffic through 3-4-5G due to additional modulator-demodulator-antenna. Some don’t because they have only one mod-demod-antenna and the system prioritizes calls over internet traffic.
This doesn’t happen when you are connected via WiFi, there are other components handling the processes there.
What’s more irritating to me is that my phone (s22) drops my mobile connection when I make a *data* call. So if I use my company’s voip (ringcentral), or even a mobile appointment with a doctor, I’ll lose 4g/5g, and thus the entire call. The issues resolve if I use a VPN. If I’m fast enough getting the VPN on after the call drops, I can pick them back up in 5 to 10 seconds.
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