Most simcards are genaric, I doubt they'll take that huge of a step to stop users from using it on other services; they just want them out the door ...
Besides, if the blackberry has shown us nothing else, it's that providers could give half a crap about choosing to allow you to download provideable updates/upgrades (WPA2 support on some older devices for example)
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.