I loathe cell phones in any situation. I never had one until '04 when the board insisted I had to. They have zero presence in climbing. A number of years ago (93?) GA and I went up to Canada to bag some stuff. We called the MEC in Calgary in May and they said conditions were awesome, by the time we got there in early July, um, not so much. It had in fact snowed the entire time since our call. We went to the N Face of Cavell first. The rangers tried to discourage us. After wading through 665wder up to my neck up high, I concurred. Then we tried the NE on Howse, but we got slammed by another storm and Greg caught a 50 lb. rock in the leg, so denied again. Looking for a consolation prize, we decided to do the E. Ridge of Temple with rope, rack, Gore-tex on our back, one tool apiece and no screws. We were approaching the base of the gully up to the summit ridge, and it slid, leaving blue ice. Oops. screwed. We retreated and about 1AM couldn't figure the next rap, and spent one of the coldest nights of my life stretched out on a ledge.
GA went back the next year, planning to bivy, and told me later his partner called the weather service from the bivy to get the forecast. I was aghast. If someone takes a cell phone on a climb with me I'll throw it off and then kick their ass. It misses the point, completely.