Only certain apps will recognize non-default fonts, so when downloading this font on your iPhone, you have to select the app that you want to open it in. Apps like Phonto, Notablity, Pigment all accept custom fonts, you just have to tell your iPhone where you want it to put it, which app to put it in. And this isn't just the case for my fonts, it's for all fonts you've get from sites like this. Thanks! Jen