Mobile device has to be in "airplane mode"?

So I’ve noticed that the SV app tells you that “if you have issues connecting make sure your device is in airplane mode”

And sure enough, while i can see the “strong” wifi signal from the SV, after connecting to it I cannot even get to the web interface unless i turn off all other radios. What is the reason the signal is so interrupted? My phone is able to operate on wifi and GSM with no issues, and the wigi strength indicator, at least up close, appears to be pretty strong from the SV. So what’s the deal here? This is mostly for my curiosity. It’d be nice to be able to get real-time maps from my 4G while working with the SV. Is this an issue with any RC that connects in this way?