Question: how to download mp3 ringtone to iphone?
Answer: Step 1 – Getting Songs into iTunes. If your song is not already in iTunes, drag it into the Music library window.
Step 2 – Import Settings. ... 
Step 3 – Convert Song to AAC. ... 
Step 4 – Convert “m4a” to “m4r” ... 
Step 5 – Move Back into iTunes.