The 4G modem uses the Quectel EG25-GL.

Network Bands Are:

LTE-FDD B1/2/3/4/5/7/8/12/13/18/19/20/25/26/28/66
LTE-TDD B34/38/39/40/41
WCDMA B1/2/4/5/6/8/19
TD-SCDMA-GSM/EDGE: B2/3/5/8