1. Switch Battery saver mode off, or connect a charger to your phone: Tap Settings > battery saver > Off.
2. Move closer to a Wi-Fi access point to get a better signal.
3. If possible, try to create a connection with some other device that supports Wi-Fi (to see that the access point is really working).
4. If you are using a home Wi-Fi network:
- Unplug the power from your Wi-Fi router, and switch off your phone. Plug your router back in first, then wait for 1 minute and then switch on your phone.
- In the router settings, remove the WLAN security temporarily, and try to create a WLAN connection from the phone without any security settings first. Refer to your router's user manual to find detailed instructions.
- If you keep getting an Incorrect password error, log in to your wireless router, and change the operating mode 802.11b/g/n to 802.11g only, and then restart/reset the router, and try to create a connection again.
- Disable other active network services such as video streaming and online games.
- Check on the router's support page that it has the latest firmware installed.
5. On your phone:
- Tap Settings > Bluetooth and switch the status temporarily to Off.
- Delete the non-functioning Wi-Fi network and connect it again: Go to Settings > WiFi > manage (advanced). Under Known networks, tap and hold on the network name and select Delete. Tap back and select the network from the list.
- Check if there is new software available for your phone: Tap Settings > phone update.
6. If you are using a public Wi-Fi network, all IP addresses may be in use. Try connecting to a different Wi-Fi network.