Robustel R1520 User Guide
RT056_UG_R1520_v.1.0.3 Dec. 25, 2021 137/159
When finished, click Submit > Save & Apply for the configuration to take effect.
The window is displayed below by clicking Interface > Cellular > Advanced Cellular Settings.
Click the right most of edit button of SIM1 to set its parameters according to your application request.