Fonts does not working on IOS (@font-face)

I am working on a project font looks good on the desktop and android phones, but when I checked it on iPhone, it's looking very bad. I think the font is not working on ios.

Here is my code:

@font-face {
  font-family: billcorpnarroman;
  src: url('../fonts/billcorpnar-roman.ttf') format('truetype'),
       url('../fonts/billcorpnar-roman.woff2') format('woff2'),
       url('../fonts/billcorpnar-roman.woff') format('woff'),
       url('../font/billcorpnar-roman.svg#billcorpnar-roman') format('svg');
}

Please help me! Thanks in advance