Although the 20 MP resolution is no longer a high-end specification for a modern single-sensor smartphone camera, the ISOCELL Slim 3T2 by Samsung focuses on other attributes instead. Advertised by Samsung as the industry's most compact image sensor, this piece of hardware was designed with full-screen display smartphones in mind.
https://www.notebookcheck.net/Samsung-intros-20-MP-ISOCELL-slim-sensor-for-full-screen-display-handsets.397251.0.html