Open the Settings app (the gray icon with gears on your home screen). Tap Wi-Fi near the top of the list. Make sure the toggle at the top is switched to green. If it's already on, continue to the next step.
In Settings › Wi-Fi, tap the blue ⓘ icon next to your network name. Tap Forget This Network, then confirm. Now tap the network name again, enter your password, and reconnect. This clears any corrupted connection data.
Hold the side button and a volume button at the same time until the power slider appears. Slide it off, wait 30 seconds, then turn it back on. A full restart clears temporary software glitches that can block WiFi from working properly.
Unplug your router from the wall, wait 30 seconds, then plug it back in. Wait about 2 minutes for it to fully restart. If other devices like laptops or TVs also struggle with WiFi, this is likely where the problem is.
Go to Settings › General › Transfer or Reset iPhone › Reset › Reset Network Settings. This resets all saved WiFi passwords, Bluetooth pairings, and VPN settings. You'll need to re-enter your WiFi password, but it fixes most stubborn connection issues.
Go to Settings › General › Software Update. If an update is available, install it. Apple frequently releases fixes for WiFi bugs in iOS updates. This step has solved the problem for many people after nothing else worked.
If you've tried all six steps and your iPhone still won't connect, there are a few other things to check. Make sure you're connecting to a 2.4GHz or 5GHz band your device supports. Some older iPhones can't connect to certain 5GHz configurations. Also check that your router isn't blocking new devices — some have a device limit or MAC address filtering turned on.
If nothing works, contact Apple Support or visit an Apple Store. In rare cases, the WiFi antenna inside the iPhone can be damaged, which requires hardware repair.
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