COMMELL HS-773 - Manual (Page 35)

HS-773 User’s Manual
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Step 4.
Insert a SIM card as shown in the photo.
Make sure the corner cut is on top and the golden pads are up.
Step 5.
Now, flip down the cap as shown in the photo.
Step 6.
Press down and slide the cap to the CLOSE position.
Make sure the cap is tightly held with the socket.