Most smartphones record only in mono, and with a very limited frequency range. While the video quality can be great at its best, the soundtrack typically suffers from a flat and metallic sound. Additionally, standard microphones cannot handle very loud environments, and start distorting badly after 110 - 120 dB.
Nokia Rich Recording provides immersive stereo and a very rich sound thanks to its wide frequency range. You can also take your phone to the loudest events knowing that the sound you record will have excellent quality.