my iphone wifi not working

Hello Karanjeet Singh,

It sounds like you are unable to connect to a Wi-Fi network on your iPhone. I would use these troubleshooting steps from the following article named:

iOS: Troubleshooting Wi-Fi networks and connections

http://support.apple.com/kb/TS1398

1. Tap Settings > Wi-Fi and turn Wi-Fi off and on. If your Wi-Fi setting is dimmed, follow these steps.
2. Turn your Wi-Fi router off and on2. If your ISP also provides cable or phone service, check with them before attempting this step to avoid interruption of service.
3. Update your device to the latest version of software.
4. Update your Wi-Fi router to the latest firmware2. For AirPort Base Stations, install updates using the AirPort Utility.

And

Unable to connect to a Wi-Fi network

1. Verify that you're attempting to connect to your desired Wi-Fi network.
2. Make sure you're entering your Wi-Fi password correctly. Passwords may be case sensitive and may contain numbers or special characters.
3. Reset network settings by tapping Settings > General > Reset > Reset Network Settings. Note: This will reset all network settings including:
   • previously connected Wi-Fi networks and passwords
   • recently used Bluetooth accessories
   • VPN and APN settings

Thank you for using Apple Support Communities.

Regards,

Sterling