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I'll have to read through it, but I sometimes shut my wireless mouse and put it in its cradle when downloading a large file over my WiFi-tethered mobile phone, place the phone in a 45-degree angle instead of flat on my desk. No scientific reason, just guessing it puts it more in direct line with the WiFi antenna in my notebook and the tower.

It is my sole internet connection here in SE Asia, and this seems to help, but maybe I am wish-biased!

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Wireless input devices usually talk in the 2.4GHz and 5GHz bands of wifi. They are allowed to, since the spectrum is basically open for anything (AFAIK) but they effectively jam wifi when in use. So this is intentional while the USB3.0 cables jamming wifi seems unintentional.

Wireless mice usually don't talk very much. Mine runs for about a year on a single battery (the spec says up to 18 months). That's MUCH too little power to be able to effectively jam anyone's wifi.

Reduce its capacity by a small fraction while the mouse is moving, yes, effectively jam, no way. That would need much more power than a wireless mouse has.

Your phone's antenna probably runs along the side of the screen, same with your laptop's. You want polarisation to match for best signal strength so it's best to have your phone as close to the same angle as your laptop screen as you can get it.

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