power sim is working in 3g by this steps with vodafone @ bpl @airtel . to work with power sim change your firmware to
1-iPhone1,2_2.0.1_5B108_Restore or 2-iPhone1,2_2.0.2_5C1_Restore custam file .
3-use power sim.
4- cut your sim properly
5-upgread power sim with preset seeting 11111000000000
7-while installing power sim stick slim sello tep on sim card bottom to top and keep some extra in out side of the tray it mean on top side of the tray
8- we r doing this to save sim tray from damage by this way we can remove sim card safely
9-after installing wait for hardaly 30 sec to 1 min
10- im tested on 15 3g iphone with in this 2 days
main thing is firmware of the 3g i phone mostly use iPhone1,2_2.0.1_5B108_Restoreor or iPhone1,2_2.0.2_5C1_Restore 