How to convert 3gp audio file to mp3?

I have a 3gp audio file recorded with my Android cellphone.

I would like to convert it to mp3, preferably on Linux, but Windows also an option.

Any recommendations?

Try ffmpeg:

ffmpeg -i in.3gp -c:a libmp3lame output.mp3

See also: Encoding VBR (Variable Bit Rate) mp3 audio

If you are on Ubuntu, you can install avconv instead of ffmpeg, since Ubuntu ships an outdated version of the latter.

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