I have always tried to pick only rugged cell phones. I like them a lot. My first hard use phone was Nokia 5210 - very good piece of gear.
Now I use Nokia 5140i (discontinued quite a long time ago). It is a little bit rugged (splashproof etc.) but nothing like legendary Nokia 6250. It has another unique features that make it a decent outdoor/"survival" phone. For example flashlight, digital compass, FM radio. I often use the flashlight and the compass. Itīs capability to withstand some falls, humidity and rain has already payed off for me several times.
I guess the Nokia will serve me for many months to come but recently released mil-spec Sonim XP3 Enduro caught my eye. I might upgrade to it in the future.

These are not true smartphones, so not ideal for everyone.