If your device's Wi-Fi is turned off, you won't be able to connect to any Wi-Fi network. Double-check if the Wi-Fi is enabled and once it is enabled try connecting to a network.
See the don't know how to enable the Wi-Fi guide should you have any difficulties in enabling it.
By restarting your device, you will kill all the processes running in the background as well as the one which might have prevented you from connecting to Wi-Fi network(s). Also, you will reset the Wi-Fi card (or adapter), which might have failed to load properly.
Consider "forgetting" the Wi-Fi network, especially if you reset your router and entered the same wireless network name (and password), but, before that, you were able to connect to that Wi-Fi network.
To "forget" the network, follow the below-mentioned steps:
Unplug the router from the power outlet and plug it back in after a few minutes. After you plug it back in, you should be able to connect to the Wi-Fi network.
You won't be able to connect to Wi-Fi, if you don't enter the correct password. Make sure that the password is entered in a correct way, as passwords are case-sensitive (e.g water is not the same as WateR).
Consider this as an option, especially if you reset your router and entered the same wireless network name (and password), but, before that, you were able to connect to that Wi-Fi network. You need to remove the Wi-Fi network from your mobile device's saved Wi-Fi passwords list, i.e. "forget" the network, and reconnect to it.
To "forget" the network, follow the steps below:
After you have "forgotten" the network, reconnect to it.
Your device's inability to connect to Wi-Fi networks might be due to a hardware-related issue, usually with the device's Wi-Fi module. In this case, consider taking your device to a repair shop, only if you have tried all the other solutions, including resetting your device to its factory settings, but none of them worked.
Maybe you can't connect to a Wi-Fi network because the router is turned off. All you need to do is to turn on the router and you should be able to connect to it.
By turning off the Wi-Fi and turning it back on after a few seconds, you will reset the mobile device's Wi-Fi adapter and you should be able to connect to the Wi-Fi network.
See the don't know how to enable/disable the Wi-Fi guide, to learn how to enable/disable the Wi-Fi.
Sometimes a reset of the network settings is all you need to fix this issue.
To reset the network settings:
Note: If you reset the network settings, all the saved Wi-Fi passwords will be deleted.
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