Last updated on April 14th, 2021 at 11:48 am
Wired have a great article here explaining why your cordless phone and pretty much all of your other wireless devices use the 2.4Ghz Radio Frequency. I won’t spoil it for you, but it turns out its all to do with your microwave!
Have a read here: http://www.wired.com/gadgetlab/2010/09/wireless-explainer/all/1