Q: I have iphone 4s and my when i open camera it is not displaying it

Hey there Jeet,

Welcome to Apple Support Communities.

If I understand correctly, there's an issue with the Camera app not working as expected on your iPhone 4s. Try taking a look at the article linked below which provides a lot of great information and troubleshooting tips that resolve most camera related issues on iOS devices.

Get help with the camera on your iPhone, iPad, or iPod touch - Apple Support

Ciao.