The Bluetooth chipset market will double from 2003 to 2004, to 146 million units. This is directly following a year when the market almost doubled, from 2002 to 2003. In 2004, headset shipments have risen due to higher demand than expected in Europe. In 2005-2008 In-Stat/MDR expects a rise in Bluetooth-enabled mobile phone availability in the US by operators that have not offered them to date, such as Verizon. In-Stat/MDR's worldwide forecast for Bluetooth mono headsets in 2004 and through 2008 has been increased significantly.