The BlackBerry Passport GSM BlackBerry 10.3 OS Smartphone connects you to your world on the go. The BlackBerry 10.3 operating system lets you complete any task and navigate your device with ease. Take and share pictures surf the web and much more on this smartphone. It is unlocked to work on any GSM carrier such as AT&T and T-Mobile. This phone will not work on CDMA Networks such as but not limited to Sprint Verizon Boost and U.S. Cellular.