As per the renders shared by WinFuture, ZTE has made a new concept phone called ZTE Iceberg which has a notch on the top and bottom.
The bottom notch contains the phone’s front-facing speaker, while the top notch contains a selfie camera, a sensor for ambient light, and an earpiece for phone calls. It has dual rear cameras and a fingerprint sensor on the back with port for smart connector similar to Moto Z Moto mods.
We think this is good concept design as it has slim notches and the bottom notch has a justified function. A slim bottom notch is always preferable than bottom chin which is common in android phones with notch.