Hi how can I install safari app on my iPhone

The Safari app is not one of the apps that can be deleted but with iOS 14 it can be removed from the home screen. If you have iOS 14, go to the App Library (swipe left past your last home screen). From there you can touch and hold an app and slide it left back to the home screen.

Another reason for it not being visible is due to a restriction. Go to Settings and tap Screen Time. tap Content & Privacy Restrictions. tap Allowed Apps. See: https://support.apple.com/en-us/HT201304#allow-apps

my safari apps is diappearted from my phone and i dont have sere

my safari app is not working on phone and sere is not working