Yeastar Technology S20 - Page 8

Yeastar S20 Installation Guide
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STEP 1 Loosen the screws on the bottom of the device and remove the upper cover.
STEP 2 Insert the module to the Module Slot.
STEP 3 Insert a SIM card on the GSM/3G module following the instructions. Skip this step if no
GSM/3G module installed.