the intercom input and flip are excellent ideas
check that it's loud enough - it should be as loud as the radio
make sure the screen is angled pretty much towards you otherwise it's really hard to read the display while you're flying
(flip good here too!)
not wanting to tell you how to suck eggs, but recommend you treat the phone as the lowest priority while flying. ie be prepared to hang up on anyone if the workload gets high. often on incoming calls they don't know you're in the chopper and want to have a nice long chat about nothing, so let them know up front
oh, if you get the push-to-talk version, remember to switch xmit to "phone" before rambling on about anything too embarassing!