On Charge and Protection
All of the technology-based communication systems require power. Most have their own batteries, and most of these will last at least through the daylight hours. A 12-volt outlet plug on a bike is easy to rig, enabling recharging in the bush, and most bike batteries can recharge a couple of phone and radio batteries overnight without affecting starting power.
There are plenty of small cases designed to keep phones and radios dry and dust-free. Hard cases will give good crash protection but are heavy and bulky; soft clear cases work best.