If you have downloaded the MP3 file from a third-party site, you cannot set it as a ringtone directly. You must convert it first: : Download GarageBand from the App Store (free). Import the "Zheka" MP3 file into a new project. Export the project as a "Ringtone". Using a Computer : Convert the MP3 to .m4r format.
The ringtone "Айфон" by Zheka is widely available on various music and ringtone platforms:
Connect your iPhone to a PC/Mac and drag the .m4r file into the "Tones" or "General" section of your device in iTunes/Finder. 4. Setting the Ringtone
Tap the price to buy and download it; it will automatically appear in your ringtone list. 3. How to Install a Downloaded MP3 (Free Method)