Samsung SGH-T255YKATFN - Manual (Page 10)

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Note: The angled corner of the SIM should be inserted as shown in the diagram on the phone. The
correct SIM orientation is necessary for your phone to recognize the SIM.
Replacing the Battery
1. To reinstall the battery, with the battery cover open, align the battery contacts
with the pins in the battery compartment in the phone (1).
2. Press the battery down until it clicks into place (2). Make sure the battery is
properly installed and not obstructing the SIM card before replacing cover.