I have recorded using multiple phones at the same time. Results are as follows:
Disembodied voices - Locational. Two phones approximately 10 -15 feet away from each other. The voice, which seemed to emanate from the location between our two phones in real time, sounded on playback that it was clearly closer to one phone than the other.
EVP - We used three phones, one on the ground, one held in hand (3 feet away), the third held by a second party approximately five feet away. All three phones captured the same EVP response at about the same volume level during a windy day in a graveyard.
Make of those results what you will. I am curious to experiment with multiple 'types' of microphones at once, to see if there is much of a difference. I am still curious though, if the other side can speak out loud (at times), than why don't they do it all the time, instead of EVP's? Such a mystery.