Palm Pre Plus Hotspot/Data Plan

[Trekkie2063]

Hey, if I turn on the wireless hotspot function on my Palm Pre Plus (to allow family access to the internet), and I continue to access the internet directly from my phone, will the data I use from the phone take data out of my data plan or my wireless hotspot "data pool"?  The reason I ask is because I hear that on the iPhone, when the hotspot is active, the data used on the phone takes from the hotspot and not the data plan.