The native file format for iPhone ringtones is M4R. In order to use MIDI ringtones on your iPhone, you must first convert them to M4R. You can use iTunes and rename the resulting audio file to achieve ...
A MIDI sound file that contains MIDI messages. MIDI files have a .MID extension. A variation of this format is the RIFF MIDI file, which uses the .RMI extension. The format of a Standard MIDI File ...