Samsung SCH-I770HAAVZW - Manual (Page 36)

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3. Insert the SIM card fully into the SIM socket as shown in the illustration
below.
4. Insert the top end of the battery into the phone housing using the
directional arrow printed on the battery. The gold contacts at the battery
end must align with contacts on the phone. Push bottom end of the battery
down until it snaps into place.
5. Slide the battery cover up until it snaps into place.