Originally Posted by bollar
No. The BT transmission can cause interference with the electronics that are used on the aircraft. In my own experience, this is usually manifested in interference heard over the communications and navigation radios.
There are a number of navigation systems on the aircraft that are analog, including the instrument landing systems, and they do not have the capability of ignoring any signal that is causing interference.
There is absolutely no way in the world that a Bluetooth transmitter will be able to reach the cockpit... With it's extremely low power it's not going to be a problem, however it is still not permitted.
Even WiFi shouldn't be a problem. GSM phones however ARE a problem as they are capable of transmitting at a full 2watts, enough to possibly cause problems.