To work as a ringtone, a music file must be an .m4r file, it can't be larger than 30 MB, and it can't be protected with digital rights management (DRM).
Če želite, da glasbena datoteka deluje kot melodija zvonjenja, mora biti v obliki zapisa .m4r, ne sme biti večja od 30 MB in ne sme biti zaščitena z upravljanjem digitalnih pravic (DRM).