Nokia 1200 Light IC is same like 1110 and 1112

Nokia 1200 Light ic same like 1110 and 1112.
How to use 1110 1112 1600 light ic in 1200 1208 1209.
this ic is same in these nokia mobiles.

This three leg ic can be used in any of nokia 1110 nokia 1112 nokia 1200 nokia 1208 nokia 2310 nokia 6030 and all such mobiles.