Samsung GALAXY GT-S5690 - Manual (Page 11)

Assembling
11
To install the SIM or USIM card and battery,
If the device is on, press and hold [
1
] and select Power
off → OK to turn it off.
Turn the screw anti-clockwise with a coin or other object
2
to unlock the back cover, and then remove the cover.
Do not use your fingernails to unscrew.
●
Be careful not to damage your fingernails when you
●
remove the back cover.
Insert the SIM or USIM card with the gold-coloured
3
contacts facing down.