The BlackBerry Wireless Headset HS-700 also supports voice commands. One other cool voice command is the “call last” command. It will call back the last person who called you while the headset was connected. BlackBerry HS-700 Bluetooth Headset works with GPS mapping apps on your BlackBerry smartphone to provide turn-by-turn directions in your ear. In addition to the advanced noise cancellation features in the HS-700, you might notice there’s no volume controls on the headset. That’s because the HS-700 will adjust the volume level automatically whether you’re walking down a noisy street or in a quiet office cubicle.