How to set a song in MP3 format as text message reminder music?

First determine whether your mobile phone supports MP3 playback. If so, you need to put your favorite music into the storage device of your mobile phone. You can download it, use Bluetooth, or connect it directly to your computer. Put the MP3 into the music folder in your phone. Most of the folders are named with words like Media and Music. Then you can set it up in the phone. There are specific methods for specific phones. The main thing is to set up - sound - text message tone - like this A sequence, then click on the MP3 you like and it's OK.