GIGABYTE GSmart G1355 - Manual (Page 5)

G1355│ 5
3. Pull the back cover with your fingertip and remove it. SIM card
The SIM card contains your phone number, memory
storage, and details of network service.
To install the SIM card
Make sure the gold contacts are facing down and the
cut-off corner is facing toward the SIM card slot. There
are two slots for SIM cards.
Upper slot is for SIM2, and
SIM1 slot is on the underside.