The Motorola Razr2 (often stylized as RAZR2) is a series of clamshell/flip mobile phones from Motorola, and is one of the series in the 4LTR line. It is the successor to the popular Razr series. The Razr2 is 2 mm thinner than its predecessor but slightly wider. Some versions feature Motorola's MotoMagx operational platform, based on the MontaVista Linux OS. The Razr2 was made available on every US carrier, and EVDO, GSM and HSDPA versions of it were released by late 2007.