How come my iphone is hnable to connect to Wi-Fi?

Why is my iphone unable to join the Wi-Fi network but my dell computer is

Try turning your phone off and then on again. Stand closer to your Wi-Fi router and try connecting.
Check the settings. Maybe Wi-Fi networks are disabled on your phone.

1. Go to Settings> Wi-Fi> Your Wi-Fi network(blue arrow)>Forget this Network. And try reconnecting.
2. Restart your modem
3. Also try by resetting the network connections on your iOS device.
You can do this by going to Settings>General>Reset>Reset Network Settings. You will have to reconnect your device to all the Wi-Fi networks that you use as they we will be lost.

My name is Sandeep and I work for the Social Media and Community Team at Dell.
One of the steps that we can try here is;
-Click on the Settings icon
-Choose General
-Scroll to the bottom and click Reset
-Choose the option Reset network connections
Once this is done, please try and connect to the wireless connections.