These are steps from the Nokia 2760 manual found at :
http://nds1.nokia.com/phones/files/guides/Nokia_2760_UG_en.pdf(pages. 12-13)
1. Press and slide the back cover toward the top of the
phone to remove the cover .
2. To remove the battery, lift it as shown
3. Carefully lift the SIM card holder from the finger grip
of the phone, and open the flip cover
4. Insert the SIM card, so that the bevelled corner is on
the upper left side and the gold-colored contact area
facing downward.Close the SIM card holder, and
press it to lock it into place
5. Insert the battery into the battery slot
6. Align the back cover with the back of the phone. Slide
and push it toward the bottom of the phone to lock it
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