Most smart phones in the market aren't designed to work in freezing temperatures.
In fact, Apple says the iPhone shouldn't be operating in conditions below 32 degrees.
When the phone's battery gets into the cold, performance will suffer.
The battery might start draining really quickly or suddenly shut down.
If that happens, warm your phone up as fast as possible.
Take it inside, or keep it near you so body heat can warm it up.
But don't worry about permanent damage the phone will be fine once it gets back to a normal temperature.
Definitely don't leave your phone out in the elements for longer than necessary.
This goes for a parked car, an outside ski locker or anywhere colder than freezing.
Also bring extra batteries or invest in a case that can boost battery life like the Incipio off-grid Pro.
When it comes to your Digital Camera, the cold has the same affect on its batteries, so bring lots of back-ups.
Also, when you're finish shooting in the cold don't immediately bring it back into a hot car house.
Let it gradually come back to room temperature by leaving it on a window sill or some other cool environment.
In San Francisco I'm Kara Tsuboi, CNET.com for CBS news.