How accessibility affect font sizes in iOS and Android?
<p>I am a designer trying to design my typography for mobile apps.
I have a question regarding how "accessibility" will affect the font sizes.</p>

<p>As in Android, you can change the font size scale from tiny to huge.
By default it is "Small".</p>

<p>As I play around with the font size, it seems to me that some font sizes within an app will change and some will not. How can I tell which font will be affected by accessibility and which will not?</p>

<p>Similar to iOS as well, how well accessibility affect the font sizes?</p>