How can I adjust the speed?

During a call, tap the Speed button at the bottom of the screen to adjust how quickly captions will appear on the screen.  (If these buttons are not visible, look for and tap Options.) Your captions will refresh before changing speed. Your selection will be saved for future calls until you change it again. Tap the Speed button again to change back to the option you started with. 

Want to adjust the speed when not on a call? From the Home screen, tap the Settings icon. Then tap Phone, tap Caption Settings, and tap Caption Display. Here you can easily change the appearance and speed of the captions you see. Scroll down to choose from two Speed options available – Option A (default) and Option B (faster).  Your selection will be saved for future calls until you change it again.