The U730 is the US variant of the U740, and "operates on HSDPA/UMTS 850, 1900 MHz and EDGE/GPRS 850, 900, 1800 and 1900 MHz in North America and EDGE/GPRS 900, 1800 MHz in Europe, Middle East, and Africa. It is tailored to the North American market and can roam in Europe where roaming agreements exist.". It is supported in Mac OS X 10.4.7 thanks to a new branch of the IOSerialFamily.kextplugins.