RE: USB leads incapacitate my mouse!
Wires with current flowing through them have magnetic fields round them and I believe consequently wires with changing currents, such as data cables, and to a lesser extent a/c power cables will emit (small amounts of) electromagnetic radiation in the radio frequency ballpark.
I'm guessing that you're right and that's where the interference is coming from. Your phone's main signal will be microwave frequency and shouldn't have an effect, but experiment.
If it's the USB cable and the mouse was expensive, try a better USB cable. A good one really ought to provide adequate shielding to keep in signals strong enough to confuse a mouse.
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