Transferring photos to iPhone

Based only on internet research: The online manual gives instructions for transferring photos to a PC or Mac with a USB cable. You could do that, then transfer them to your phone.

Based on the methods described in the online manual (which is quite old), you might be able to use the same cable and setup on the camera, but that's a guess. You would need a USB/Lightning adapter to attach the cable to the phone. Beyond that, it is hard to guess whether Photos would recognize the camera and offer to import the pictures or whether the camera would just look like a disk drive that you could access with the Files app.