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Two mo

Cordless telephone interfering with Wi-Fi connection when in close
proximity to computer. It will swamp the desired signal.

Cell phone to close to bluetooth mouse. It will also swamp the desired
signal.

Many low powered devices operate on the same frequencies. They operate
under what is often called Part 15 of the FCC rules. If you look at the
fine print on them, you will see something like they must accept
interference from other services, but can not cause problems.

That means all the Part 15 devices such as the cordless telephone and Wi-Fi
can interfere with each other and that is ok. They just can not interfere
with any licensed devices and must accept interference from them.