The steps to convert mobile phone recordings into local music are as follows:

1. Find the recording file on your phone: Open the phone’s file manager or recording application and find the recording you want to convert. document.

2. Copy or move the recording file: Select the recording file, and then copy or move it to a convenient location in the phone storage.

3. Change the file extension: If the recording file extension is not a commonly used music format extension (such as .mp3), you can change it to the desired music format extension.

4. Use the music player application: Open the music player application on your phone, and then import the folder or path where the recording file is located.

5. Mark music information (optional): If you want to further manage the recording files, you can use the music player application to add music information to the recording files, such as title, artist, album cover, etc.