CNBC:

Your iPhone might shut off if you’re walking outside during the kind of freezing temperatures that we’re seeing all around the United States thanks to the polar vortex. It’s a problem many of my New York City-based colleagues verified when I asked about it Thursday morning.

Sometimes their iPhones just turn off, they said, and the phones don’t turn back on until they’re warmed up or plugged in again.

And that’s the last thing you want to happen when you’re freezing as you walk on the sidewalk and use your phone to find directions.

There are a lot of serious issues when it comes to the cold hitting parts of North America this week so this may seem minor but it’s good to keep in mind regardless.