There's nothing quite like being outdoors, be it cycling, rock climbing or just a general stroll through the woods. The only downside is that the further out into the wilderness you go the less chance you have of your mobile working - and of course chatting on a walkie talkie is free, as opposed to the ruinous charges of mobile chit chat. Make sure you and your friends can keep in touch and pack the Slim Walkie Talkies in your rucksack. They have a range of up to 3km and they're so small you'll forget you have one on you until your trousers start talking to you. You can select 8 channels (with 38 CTCSS codes for fine tuning), so if someone else in the vicinity is using a two way radio you just move onto the next channel until you get a clear signal. They're tiny, tough, hugely versatile, and a lot cheaper, more fun, and more reliable than a phone.