hmm.. ok so most microphones are directional or can switch between different variations of pick-up patterns.. which means they can reject sound from certain directions, dependant upon their placement and pick-up pattern. also stereo mic techniques can be used to cancel out background noise (if you have 2 mics) id also definitly look into gating your input aswell as checking that your NOT using a pad and maybe even just turning your levels down a little..? oh an tell your mate to lose the phone when recording! LOL hope this helps a little..