COMMELL HS-773 - Manual (Page 34)

HS-773 User’s Manual
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2.12.1 <SIM Setup>
Step1.
SIM card holder is marked by circle.
Slide the cap toward OPEN direction, see red arrow.
Step 2.
Make sure the cap is now at the OPEN position.
Step 3.
Flip the cap up and insert a SIM card into socket .