How do I get rid of obsolete wifi networks?
How do I eliminate obsolete wifi networks from iphone 12
iPhone 12, iOS 14
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In iOS you can only “Forget this Network” if you can “hear” the network.
The only other alternative is to “Reset Network Settings” … which erases ALL saved networks as well as resets the name of the device to [default].
Settings -> General -> Reset -> Reset Network Settings.