I spend hours running outside in the winter, too, and find that electronics of any form are mostly unreliable when it gets cold enough. I run with a Garmin GPS

I spend hours running outside in the winter, too, and find that electronics of any form are mostly unreliable when it gets cold enough. I run with a Garmin GPS watch, and after several hours of single digit temperatures (F), the watch will often die. Phones don't even last that long. I doubt these will be any better in the same situation.