Samsung SGH-S390CSATFN - Manual (Page 12)

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3. Replace the battery cover onto the back of the phone in the direction shown
by the arrow (1).
4. Press down along the bottom of the phone until you hear a light click (2).
5. Press down firmly along the edges to ensure that the cover is flush with the
phone (3).
Note: Make sure the battery is properly installed before switching on the phone.