You pointed out earlier that we are talking about p/w climbers here. Your climbing partner just sounds scared.
And your other partner sounds shit outta luck. Personally, if my partner asks me to call during a trip, I will find a way to do it. I figure if I can accomplish the feat of climbing, I can accomplish the feat of communication. I will do whatever I have to in order to live up to my half of the bargain--in all relationships. But hey, to each his own and you gotta do what works for you--you're the one who gets to live with the reprocussions.