Well, as far as we can tell, the company achieved that by keeping minimum bezels and offering curved dual edge display on the front and the curved edge on the rear. (phoneradar.com)
This handset sports a 6.2 - inch QHD (2560 x 1440, 529 PPI) Super AMOLED Dual Edge display, along with 4 GB of LPDDR4 RAM and 64 GB of expandable native storage (expandable up to 256 GB via a microSD card). (androidheadlines.com)
We have seen Samsung Galaxy Note Edge comes with a curved display on right side, whereas the Galaxy S6 Edge and Galaxy S6 Edge + are smartphones with dual edge display. (bgr.in)