BlueTomorrow.com

Just as your voice can go unheard by others due to other noises, so too can Bluetooth radios go unheard due to other radio interference. This issue is especially a concern as Bluetooth wireless technology uses an unlicensed band for transmissions. Fortunately the technology was designed explicitly to be both a good citizen in these frequencies by not producing unnecessary noise but also to be able to avoid other radio waves. Some common radio technologies which can affect Bluetooth wireless products include microwave ovens and some models of cordless phones.