Yeastar S412 Installation Guide
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STEP 3
Insert a SIM card on the GSM/3G/4G module following the instructions. Skip this step if no
GSM/3G/4G module installed.
STEP 4
Close the cover and fix the screws.
STEP 5
Rotate the antenna into the Antenna Socket. Skip this step if no GSM/3G/4G module
installed.