The aspect ratio of the photos taken with all iPhone cameras is 4:3. If you use an app that offers a different aspect ratio, it crops the standard aspect ratio to give a widescreen photo. You can also crop the standard aspect ratio while editing a photo to give any aspect ratio you desire.
Thank you for your help. I was checking my old pics. U r right. All of İphone pics 3/4. I was thinking it is 3/2, Because I was using my ex phone like a remote control for my mirrorles photo camera. And it's ratio was 3/2