It asks for Country code means it locked to network ,but country code unlocking is suitable for Other Brand Phones,But for Unlocking I-Phones You can use the Remote Unlocking service,that is best and suitable for I-Phone Network Unlocking.You can get the remote Unlocking service from here Theunlockspot.com
and unlock it,you can follow the instructions below and unlock it step by step.........
Apple iPhone 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 phone software is updated to the latest version using the iTunes software.
4. Connect your Apple iPhone to iTunes with a NOT ACCEPTED
5. Wait until iTunes detects your Apple iPhone.
6. Disconnect your Apple iPhone and reconnect it after 10 seconds.
7. Your Apple iPhone is now unlocked.