The MMSC acted as a relay. It analyzed the receiving handset's capabilities. If the receiving phone supported 3GP, the MMSC delivered the message. If the target device had a different screen size or supported different codecs, some advanced MMSCs attempted to transcode the video on the fly so it would play correctly. Modern Compatibility: Do 3GP Videos Still Work?
What you are currently using (Windows, Mac, Android, iOS). 3gp desi mms videos work
For permanent preservation and seamless compatibility, old 3GP files can be converted into standard MP4 files. Free software tools and online video converters can unpack the original H.263 or MPEG-4 video stream and re-encode or remux it into a modern container that plays flawlessly on any current smartphone, tablet, or smart TV. The MMSC acted as a relay