The Settings > Appearance page should allow the user to set a custom font size (small, medium, large, or point size). Using the system font size helps, but setting this as a custom setting would make it more accessible for people with poor vision.
Also, similar to the Samsung Messages app, when a user has opened a conversation, pressing the hardware Volume + or Volume - should make the text font size get larger or smaller.
The Settings > Appearance page should allow the user to set a custom font size (small, medium, large, or point size). Using the system font size helps, but setting this as a custom setting would make it more accessible for people with poor vision.
Also, similar to the Samsung Messages app, when a user has opened a conversation, pressing the hardware Volume + or Volume - should make the text font size get larger or smaller.