izznur ,
You can change the default font on your phone.
Step 1 : You should have to root you phone (Kingo root tool is one of easy way to root your phone ( Note : Rooting may cause to void you warranty of device)
Step 2 : Backup existing fonts : Use play store app to backup fonts
Step 3 : Install any font you want to root directory named as Fonts : you can use Font install app on playstore