Find a mobile phone that can enlarge the system font, SMS font, like Samsung, and it is a general mobile phone amplification process that is greatly enlarged.

There is system font enlargement in the settings ~ display of Samsung mobile phone. In the SMS settings, there is also font size adjustment. There is also font enlargement in wechat settings ~ universal.

If you have to have a fairly large font, that's the only old machine. Whether it's a telephone keyboard or information, the font is quite large.