You can change the font size of your captions in the settings of the Olelo app.   For iPhones:   Open the menu options by tapping on the menu icon   Tap Settings   Use the slider to adjust the caption size     For Android phones:   Open the menu options by tapping on the menu icon   Tap Settings   Tap Accessibility   Use the slider to adjust the caption size     You can also adjust the caption size during a call in the call menu