Yeastar Technology S-Series - Page 21

Installation_Guide | 1 - Installation Guide | 21
1. Loosen the screws at the bottom of the device and remove the upper cover.
2.
Insert the module to the Module Slot.
3.
Follow the instructions to insert a SIM card on the GSM/3G/4G module.
Note: Skip this step if no GSM/3G/4G module is installed.