These show both a flat screen version, as well as a dual curved screen variant of the smartphone. (youmobile.org)
So the original version offered a smaller sensor under just one portion of the screen, while the new half - screen variant uses a larger sensor to increase the available scanning region. (androidauthority.com)
While the 5.5 inch screen variant with model number ZE552KL comes with 4 GB RAM and 64 GB Storage. (maktechblog.com)