Phones with OIS (main + periscope)

OIS (Optical Image Stabilization) counters hand shake with hardware: the lens inside the camera module is shifted in the opposite direction within milliseconds, guided by motion sensors. That is what separates it from software stabilization — nothing is cropped, and the shake is physically cancelled before the light ever reaches the sensor.

In daily use it matters most in two places: photos in dim light and video shot while walking. When light drops, the phone has to keep the shutter open longer; OIS absorbs the hand shake across that longer exposure, which is why night shots come out visibly sharper.

The value on this page says stabilization is present on the main camera and the periscope telephoto. A periscope is the telephoto type that fits a long focal length into a phone by folding the light path through a prism; the highest zoom levels live there, which makes it the lens where OIS works hardest.