I haven't used the service for unlocking the I-phones from Network lock,I used the remote unlock service to unlock it from network lock,You can get the remote unlock service for I-Phone 4 at here Classicunlocking.com and unlock it from Network lock,then you can use with any GSM Network Sim card in the Phone....
Apple iPhone 4 Unlocking Instructions
1. Wait for us to send you an email saying your phone has been activated or remotely unlocked.
2. Install the latest version of iTunes.
3. Make sure your Apple iPhone 4 phone software is updated to the latest version using the iTunes software.
4. Connect your Apple iPhone 4 to iTunes with a NOT ACCEPTED SIM card.
5. Wait until iTunes detects your Apple iPhone 4.
6. Disconnect your Apple iPhone 4 and reconnect it after 10 seconds.
7. Your Apple iPhone 4 is now unlocked.
