REDFLY works with most of the common BT stacks. There are some however that don't work. For example the Motorola Symbol MC 70 and MC 75 use a custom Motorola stack. We had enough of a demand to support those devices that we wrote a new driver just for their stack. To be save, you need to make sure that the exact phone (or something very similar ie. TyTN II vs. Tilt) show up on the list of
supported phones before you commit to anything.