I received this marketing email in my Inbox this evening just before 7pm.
https://mailchi.mp/f9eff4979701/buy-an-anti-radiation-sticker-radi-save-price-1999-only
I can believe that what is (I assume) a reputable company is peddling this utter crap. A mobile phone *must* emit EMF - that's how it communicates with the cellular network. Likewise WiFi devices.
I replied to the email, politely suggesting they should seek to be ethical in their business dealings.