You will need:
- ZTE V9 upgraded to Android 2.2 (see my other article)
- Your IMEI number
- APN details for the non Optus sim
Enter your IMEI, select ZTE on the form and type the captcha.
You will be given a unlock number.
When you insert a non Optus sim you will need to enter this number to unlock it.
Now go to Settings -> Wireless and networks -> Mobile networks -> Access Point Names and tap the menu side key to add a new APN.
Enter the APN and check internet connectivity!