It may depends on your rom/os brand. On my device (oxygen os 13.x), I can restrict access somewhere deep into mobile network settings (the translation may not be good as I have it in French) :
Settings > mobile network > data consumption > network access.
And here I see all apps. I can restrict mobile network, WiFi or both.
This article is so much better than what was posted 2 weeks ago (https://lemmy.nz/post/2974266).
Now I do understand it better, tho still not perfectly.
So it can be used to manage hot spots in chips and semiconductors.
If you don't know why it matters, in one of these 2 videos (I don't remember which one) Der8auer discusses with an intel engineer the challenges of designing a chip, where to put the thermal probe and why some parts are designed like that :
Basically : the heat travels through the chip at different rates depending on the material distance... And finding the hot spot is very challenging.
So having better cooling where it matters can be a benefit for chip cooling and efficiency.
Now I don't know if this tech can evolve into something which can be used for this.