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Yes, you can change the size of the text in the Samsung message app, but I'm more interested in changing the font type.With the Google Text App you can use to two fingers to enlarge the text message which gives you bigger fonts. Not sure if it works on Samsung
Samsung are usually consistent between devices like the s21 and s23 when they are on the same software version. I just checked and the Samsung Messages app on my s21 uses the system font, so if I change that via the "font size and style" option in the display settings the font in Messages changes. And as my phone is on the July 2023 update, so I would expect it to be running the same version of that app.
I actually use Textra myself, which has an option to use the system font rather than its own, so changing the system font changes the message font in that app too. If you don't use RCS (sometimes called "Chat features"), which I think the Samsung app supports but few others apart from Google's Messages do, you could try that. Actually if you do use RCS you could see whether the font changes in Google's app, which is probably pre-installed on your phone (I have it disabled, so don't particularly want to re-enable it to test).
NopeDoes textra have RCS yet
I can confirm this on my z fold 4.Yeah, one of those will be Google's app called "Messages", the other will be Samsung's app with the same name. It is confusing! I suspect you were using the Google app, and that the Samsung one is the one that does change font (because we've both seen it change on the s21).
Most providers in most countries support it now, though it took a couple of years to roll out. The question is what fraction of people use it?Wow, I've had RCS for a while and thought everyone had it now