Q: I have iPhone 4S I lost wifi completely on my phone. Can I fix it?

Hello pravin1454,

After reviewing your post, it sounds like the iPhone is not able to find a W-Fi network. I would recommend that you read these articles, they may be helpful in troubleshooting your issue.

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support

Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support

Thanks for using Apple Support Communities.
Have a nice day