From forbes.com

There have been plenty of cyber agency warnings for smartphone users in recent weeks. Only use encrypted messaging. No more SMS security codes. Avoid commercial VPNs. And update phones as soon as you can — which is timely this week. But now there’s more — you’re told to “completely deactivate Wi-Fi” whenever it’s not in use.
Most of the above advice comes via CISA, America’s cyber defense agency, but the latest is from CERT-FR, France’s equivalent, in conjunction with the U.K.’s agency. There is already plenty of Wi-Fi advice, but to completely disable the interface is new.