Pick the exact 30 seconds of a song you love.

For Android, apps like "Ringtone Maker" are popular. iPhone users often use "GarageBand" to convert MP3 files into the required .m4r format.

Use your chosen tool to convert the source into a high-quality MP3. If you are an iPhone user, you will eventually need to rename or convert this to . Step 3: Trim the File Most phones limit ringtones to 30 or 40 seconds. Select the "hook" or chorus.