Yes, the JioPhone does have FM radio. In fact, it is wireless FM radio. You do not require to use the earphones to use the fm radio.
Yes, You can type in Malayalam language in JioPhone. JioPhone supports 22 Indian vernacular languges.
Yes, JioPhone does have a dedicated audio player and you can play your favorite MP3 tracks over it.
Yes, JioPhone is a dual sim mobile phone. You can use one 4G sim card and one 2G sim card.