Samsung SGH-T105YKGTRF - Manual (Page 8)

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2. Lift the battery up (1) and away from the phone (2).
Installing and Removing the SIM Card
Important!: The plug-in SIM card and its contacts can be easily damaged by scratches or bending.
Use caution when inserting or removing the SIM, and keep all SIM cards out of reach
of children.
1. Remove the back cover and battery.
2. With the gold contacts facing down, slide the SIM card completely into the
socket with the notched end oriented as shown.