Funtouch OS 9. 1 or below: the font of SMS interface can be independently enlarged and reduced (without affecting the font size of the system).
When the text message font becomes larger, open the information details interface, and hold down the screen with two fingers and slide relatively (the two fingers slowly close together) to reduce the font.
OriginOS/Funtouch？ OS？ 9. 1 and later versions do not support this function.
The reason for this is the following：
1, the font size is the uniform size of the system, and the font size of the system can be adjusted uniformly in the settings.
2. You can double-click the information copy to enter the full-screen enlargement page to view the enlarged font.
Font size adjustment method:
1, Origin OS/iQoUI and Funtouch OS 4.0 and above systems: enter Settings-Display and Brightness-Font Size/Font Size and Thickness-and drag the indicator bar left and right to adjust the font size;
2. Before 2.Funtouch OS 4.0: Settings-Wallpaper and Font-Mining-Font/Local Font-Font Size /A in the upper right corner.
Some software, such as WeChat, browser, etc. , you can adjust the font size independently in the internal settings of the software. If the adjustment in the I topic is invalid, you can enter the application settings to operate.
If you still have more doubts, you can enter vivo official website-My-Online Customer Service-Enter labor and consult online customer service feedback.