Gentlemen,
Regulars will recall I asked here a while back about wifi jammers which would only allow a smartphone access to one's WIFI network only when expressly permitted to do so and not whenever Google felt like it. Jeff kindly suggested one of these little beauties and I duly ordered one.
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I didn't fancy building Jan's circuit as dealing with the practicalities of the strays and parasitics of a 2.4Ghz oscillator would be way beyond my pay grade. I suck at anything over 100Mhz TBH.
Anyway, it finally arrived from China and it works great! Here's a vid showing it in use:
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(It's not me in the vid, BTW.)
Take back control of your privacy, guys! ;-)