The hotspot is the phone, not the carrier. It's like asking if you can get the Sprint Maps to work when you run that phone on ST.
The problem is that if ST catches you tethering, your phone goes dead. That's a violation of their TOS, and they cancel your account.
Can it be done technically? Sure, as long as the hotspot app works on that phone. (It's installed as a system app, not as a user app, but it's still just an app.)