CYPHER_LYNX hey there! The x2 zoom in phone (2) is not optical, but digital. This means that, from the original 50MP image, the phone crops out part of it, leaving you with a x2 image at 12MP. You can check that trying to use the 50MP mode, and you will notice that the x2 zoom is no longer available.
It is impossible for Nothing to add more optical zoom, as that is a hardware feature that depends ond the physical lenses on your phone.
Phone (3a) has x3 optical zoom because it has a periscope lens that distorts the light to make the zoom effect. However, it’s impossible for the periscope lens to widen the image (going back to x1 zoom) and that’s why the phone has several lenses.
I hope this helps you understand a bit about the camera hardware on both phones. I am a Phone (2) user and it’s true that sometimes I miss having a telephoto lens on the phone, but overall I’m very happy with how the camera works
