Now, there are quite a many complaints saying that Android phones are unable to hook up to Wi-Fi without knowledge.

• A simple trick worth trying is to toggle off your Wi-Fi for a while. Then, give your device a fresh reboot.

• Perhaps it sounds incredible, but it does work out some problems, for turning off your device can shut down all apps running in the background.

• Another way is to forget the Wi-Fi network to which your device is currently connected

• something wrong updating your info with the Wi-Fi, so please try as follow.

• The router might be the culprit. Please check out whether is working well in the first place.

• If you cannot tell whether it's running normally, it's recommended to restart the router again.

• Also, if possible, you can reset your router and see whether you can hook up to Wi-Fi now.

• If your device has been connected over a bunch of Wi-Fi networks, there must be cached data of Wi-Fi information stored on your cell phone.

• Possibly, you might fail to connect to Wi-Fi if some cached data are corrupted. In such a case, you'd better reset your network settings.

• Please follow the instructions.

• Apart from all the methods above, there is a final way to troubleshoot this Wi-Fi problem.

• In fact, this last resort works on most system glitches - Factory Reset.

• If you still cannot access over Wi-Fi, please try it out.