my device type is Network adapters,and device provider is %V_WIDCOMM% , now BluetoothDeviceInfo[ array = bc.DiscoverDevices() can't find any device , what's wrong ? could you help me out ?

Hello All, I am working on a bluetooth based project and I need to identify the model of bluetooth mobile device. I want to know whether it is possible to identify model of mobile via their Bluetooth Service Records. Please help me I need it in very urgent. Thank You