I think the Bluetooth ability is first a Samsung thing although software must also be required too. 

The Charge phone supports Bluetooth 3.0 + EDR whatever that is.

For Human Interface Devices the Charge supports HID V1.0 devices.

I found this info on pages 80 and 101 in the Samsung Droid Charge User Manual.  I looked at the manual because I wanted to see if the phone would support a portable remote Bluetooth stereo speaker and it does.

It also supports remote bluetooth printing and headsets.

JerryF