ocr: feadset and Cellular palmtop phone Laptop Transmitter : : Esuetooth PAN Laptop eluetooth LAN - Bluetooth WAN PAN Plan. Bluetooth devices form a secure Per- sonal Area Network (PAN) between a user's compatible devices. Here, voice and data from a headset and palmtop are carried over the PAN, then relayed by cellular phone to the WAN.The BlueCore CF+ can also be used to transfer files between user, over ad hoc wireless LANS.