Samsung SM-G889YB/DS User Manual page 22

Basics
5
Replace the back cover.
Align.
6
Turn the screw clockwise to lock the back cover.
Using dual SIM or USIM cards
If you insert two SIM or USIM cards, you can have two phone numbers or service providers for
a single device.
Activating SIM or USIM cards
Launch the Settings app and tap Connections → SIM card manager. Select a SIM or USIM
card and tap the switch to activate it.
1
22
2
Press.