Why is my iPhone 15 Pro's 3x telephoto lens not activating in low light and experiencing severe shaking while zooming?

I am facing an issue during camera lens switching and zooming on my iPhone 15 Pro that is related to a specific telephoto (3x) lens. Lens switching happens correctly in bright light conditions, but in low light or indoor conditions (like a gym or room), when I zoom 3x in video mode or photo mode, the device does not activate the telephoto lens and digital zoom happens from the main lens instead. I also manually tested it by blocking the lens with my finger — at 3x zoom, despite blocking the telephoto lens, the image or video does not turn black, which means the lens is not being used. In the same lighting conditions, the telephoto lens of my friend's identical iPhone 15 Pro is getting activated while it is not happening in my phone. This suggests that either the lens switching logic is working wrong in my device or there is a calibration issue of the telephoto lens. Apart from this, when I zoom more than 3x in video mode (or come back from max zoom to 3x), then I get to see noticeable camera shake or lens movement vibration-like effect, which does not seem like normal zooming behavior. I suspect either the lens stabilization is not working properly or there is some hardware calibration issue in the lens transition. I would like you to thoroughly check the device's lens switching behavior, telephoto activation in low light, lens calibration and OIS (optical image stabilization) working.

[Re-Titled by Moderator]