It is a container that supports all kinds of media such as video, audio, subtitles, 2D and 3D graphics. It is possible to open MP4 file with almost any player on Windows but on Mac you should use a plug-in or just convert the file to another format. The container requires little bandwidth, storage space and data usage that is why it is ideal for cell phones. Moreover, it is possible to choose it from your Google Drive or Dropbox account. Now your video is uploaded and you can start the MP4 to 3GP conversion. If it is needed, change the output format to one of the 37 video formats supported.