A: Unfortunately, iOS has strict security rules. Apps like WhatsApp, Instagram, and Messenger use their own default system fonts and do not allow you to change them inside the app. You can only use custom fonts in apps like Pages, Numbers, Keynote, Microsoft Office, and Adobe apps .

Developers found a loophole: apps can bundle their own fonts. So if you used a Bangla keyboard app (like Gboard or Ridmik Keyboard ) or a Bangla reading app (like কথা or Bangla PDF Reader ), you could see beautiful fonts—but only inside that specific app. Copy-paste that text into Notes, Messages, or Safari, and it would revert to ugly system defaults.

Apple provides built-in Unicode Bangla support. Starting with iOS 18 , users can access alphabetical layouts for Bangla directly in the system settings.