In reply to Jimp97:
I have a pair of Motorolas that cost $10 about 20 years ago. They work fine, in all weathers. All they need is a range of 60m. If the two of you are separated by a big arete they are unlikely to work, but nothing that is contextually appropriate will.
Some years ago, another pair on a route on a wild day in Scotland took the piss out of us an dour radios. A few hours later, sharing a stance, with the blizzard going full pelt, ropes flailing all over the place, and limited visibility, the other party was bellowing into the gale and achieving nothing. I meanwhile, chatting to my partner on the radio, let a suitable amount of time elapse before asking if they would like us to pass a message for them. Revenge is a dish best served cold....