Hi,
FIRST is it a screw back (with slots on the back case).
If so use a small screwdriver to move the case.
If not poss. then get a case removal tool for screw back cases.
If it has no slots then look for gaps in the case. Use a mag glass, then insert a small screwdriver and twist, if not move get a case removal
Hope this help's.
lostforwords
May 2009