Samsung ITP-5021D 用户手册

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页码 139
1-9 
 
–  The handset hook should also be changed so that the handset is secure 
  when mounted on the wall. Push out the handset hook from the holder, 
  turn it through 180
o
 and push it back into the holder. 
 
 
 
Installation is complete. Now find out what features your phone supports by going 
to Chapter 3