My husband and son won them getting off Everest.
I was in the bathroom with my 3 year old. There was really bad reception. I thought he was just tired of waiting for me.......you can see where this is going.
I finish the drama in the bathroom with my son.....he calls again a minute later as I am leaving the bathroom. RUN! HURRY! WHERE ARE YOU! I thought the Yeti ate my son or something. He was so frantic.
Well, I get there and see the DT there and my husband was flipping out that they would leave (I don't think they would have, but he was all anxious as get out!). They were waiting for me to come back to give us our two passes. It was a good five minutes from the first hysterical phonecall, then the second, til I got back to Everest.
So yeah, I wouldn't worry, as long as you have a cell phone.