How to fix Wi-Fi weak security ?
How to fix Wi-Fi weak security
iPhone 6s Plus, iOS 15
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Change your router security settings to WPA2 AES or to WPA3.
If you don't have instructions, do an internet search for your router brand/model or if you router was supplied by your internet security provide, check their website.
Also see: Recommended settings for Wi-Fi routers and access points - Apple Support