Does "Reset Network Settings" affect all devices?
What, precisely, does &quot;reset network settings&quot; do on an iPhone?



  resetting network settings will remove all saved WiFi passwords in iCloud keychain, effectively deleting remembered WiFi networks from all your signed in devices. A workaround: turn off iCloud Keychain, then reset network settings, then turn iCloud Keychain back on. Your saved WiFi networks will then sync back, unharmed.


This is the behavior in devices running iOS 9 and later.