New unlocked Telstra Blackberry Bold, I hav a TPG (Optus) sim card but

can't access (GPRS) internet. Solution? Just purchased outright a new unlocked Telstra Blackberry Bold 9000. I currently have TPG (Optus, also known as Soul) sim card. I understand that TPG does not offer BIS for blackberry push email access. So alternatively I would like to know how to set up GPRS settings so I can access the internet.

Any help to set this up would be great. Thanks!