Which phone do you have currently? Does it support 5G? Also, 5G is accessible only in certain parts of India, so make sure that you are in a 5G enabled area.
Yes, it may not be available for A03s. Samsung usually doesn't give more features to budget phones. Even A50, A70 and A52 lacks some features which are present in flagship phones.
It is pre-installed in some Samsung phones.Swipe down 2 fingers from the top to open the quick settings panel.Then search for "Smart View". If you don't find it, swipe to the left or right side. If you still don't find it, click on the 3 dots on the ...