This handwriting font for Samsung and HTC phones is the best and the easiest way to change the fonts of your phones!

All you need to do is download and install this app, then restart your device after. This is all that is required to get this app working on your phone.

For Huawei phones, you will have to do the following steps (2 Options):

Open Themes > Text Styles 
OR
Open Themes > Customize > Text Styles

Then choose the font that you liked to use from the available ones, and click the button "Apply".