It is not actually possible to "convert" REL audio files to MMS format. However, you can send a MMS with audio from the Nokia phone REL file. Probably used on old Nokia phones for sending ringtones via MMS service.
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Conversion of rel file format to mms file format beta
Search for rel to mms converter or software able to handle these file types.
Convert Nokia audio data to Multimedia Messaging Service message.
Unfortunately, there is no detailed software record in the database that match this conversion.
Additional links: rel file extension details, mms file extension details
REL
Files with rel file extension can be also found as old audio files recorded by some Nokia devices.
MMS
Files with mms extension can be most often found as multimedia messages saved in special Multimedia Messaging Service message file format. An .mms file stores multimedia objects (images, audio, video, rich text) sent through mobile phones with MMS support.
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