1: Restore Your iPHONE 3G with origianl iPhone1,2_3.1.2_7D11_Restore.ipsw by iTUNES
2. Then use blackra1n_r3.exe to activate/jailbreak
3. Now use custom firmware already activated iPhone1,2_3.1.2_7D11_Custom_Restore.ipsw to restore Your iphone with iTUNES
4. Run again blackra1n_r3.exe to activate/jailbreak and unlock Your iphone
Since NOW YOUR IPHONE IS WORKING WITH ALL SIMCARDS
All is tested on blacklisted iPHONE 3G from Polish ORANGE
Now U can use Your iPHONE in any network - REMEMBER - DO NOT ACTIVATE YOUR iPHONE by iTUNES with Your original local operator SIMCARD - USE THIS CUSTOM ACTIVATED FIRMWARE ONLY !!!
Good Luck