I've just brought an alpkit airo180 pretty thin, rolls small and nice and light weight so could walk and carcamp with it. Seems pretty comfy so far but yet to use it properly just testing it in the garden and that, but then again anything would seem comfy compared to not sleeping on one like i used to.
My mum got a samsung b2710 which i think is the new verision of the solid extreem, got her that as shes pretty good at breaking her phones. So far it has servived the year and seems really good little phone, has a few basic feature built in like internet, camera, facebook and that sort of stuff (not that youl use it n the hills) but also has a handy tourch. It did get a crack in the screen but that was from our dog biting it so nice bit of strong pressure on small surface area so to be expected, and one of the socket hole covers has become a little tougher to put back into place at times. i would recomed one as a tough phone and she got it free on a cheap contract.
I personally use an old cheap samsung phone worth a few quid that if it breaks or gets lost is no great problem leaving my htc at home safe n sound.