Why does mine say security weak
Why does my phone say my internet is weak when it connects
iPhone 8 Plus, iOS 14
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This is not a comment on the strength of your wifi connection, but rather the strength of your wifi's password. You need to check your router security setting to make sure it’s WPA2 (AES). It is the latest security protocol. If you’re not sure how to do that, call your internet provider and ask what it currently is, and have them change it if not.
Just to be clear, if your router is not set to WPA2 (AES) or WPA3 it has ALWAYS been insecure; you just didn’t know it was insecure until iOS 14 checked it.