Samsung SM-J510MN User Manual page 17

Basics
– Type 2 (SM-J710MN):
► Dual SIM models: Insert the SIM or USIM card with the gold-colored contacts facing
downwards.
Insert the primary SIM or USIM card into SIM card slot 1 (
USIM card into SIM card slot 2 (
– Type 1 (SM-J510MN/DS):
).
2
17
) and the secondary SIM or
1
2
1