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How to change the font color of mobile phone to black?

The font color of vivo mobile phone system is black by default (the color will be automatically adjusted according to the background color). If you want to change the font color, you can go to I Theme-Recommendation-Font Selection-Search for "Colorful" and download your favorite color (you need to pay).

Note: I theme fonts support trial use. You can try it before you buy it.

If you need to know more about the I theme, you can enter the manual customer service for consultation in vivo Game Center-My Settings-Online Customer Service.