BB Bold 9000 :: Unique Blackberry PIN Is Still Connected To Company?

I have recently purchased a blackberry bold 9000 secondhand. It is originally a telstra device (it's covered in Telstra logos and on start up it has the telstra splash screen). I purchased it from a man in New Zealand, who himself purchased it from the person who had it on your network, so finding any information about the original owner is nigh impossible.
I just want to know if the unique blackberry PIN is still connected to your company. I have the PIN and IMEI numbers registered to me with the my current carrier (telecom new zealand), also as a precaution I have upgraded the OS to my carrier branded version 5.0.0.592 (bundle 1004,platform 5.2.0.57), (this is the latest version my carrier supports).
Interesting things to note is that when connected to a wireless (wi-fi) connection with internet access, many of the applications can also access the internet. I am not connecting to any enterprise server, the VPN settings are disabled, the APN settings are set to direct.telecom.co.nz with blanks for both the username and password. I have tried deleting and resending the service books many times (each time followed by a"hard-reset"). I have tried wiping the device several times. The dataservices option in the mobile network options menu is turned on, is reading as the correct carrier, and is tuned to the right network mode (3G & 2G).
The browser option, under advanced options, which in turn is within the options menu, has only one setting, "Default browser configuration:" which is showing a blank space, and does not give the option to change it.The exact error says that
"Your device does not currently have any Browser Configuration Service Book Entries.Please contact your service provider to enable the Browser on your device.