Sumtech 7100

Overview
"C790_MB_V1.1" is silkscreened on the board in the FCC photos.

This device is MediaTek based (appears to be using MT6250A..)
 * Skyworks GSM FEM
 * appears to have MediaTek based Wi-Fi (b/g/n, presumed to be single-stream)

The FCC test report specifies additional models of NOTE2, ST7100, ST70, and ST700