Weak security on my Wi-Fi connection
How do you change the security settings on a connected network after setup is complete?
iPhone SE (Gen 2)
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This message indicates that your iPhone is connected to a Wi-Fi network that is using an older wireless security method. To "change" this, you would need to reconfigure this network's wireless router to use WPA2 or WPA3 security.
Ref: Recommended settings for Wi-Fi routers and access points - Apple Support