If your iPhone won’t join a network or keeps dropping the connection, try these steps.
1. Toggle Wi-Fi
Turn Wi-Fi off and on in Settings, not just Control Centre.
2. Forget the network
Settings > Wi-Fi > tap (i) > Forget This Network, then rejoin.
3. Restart iPhone and router
Restart both.
4. Turn off Private Wi-Fi Address
Some networks don’t work well with it. Tap (i) on the network and turn it off to test.
5. Reset network settings
Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. This removes saved Wi-Fi passwords.