Most lithium-ion batteries, those found in mobile devices included, are incapable of working when exposed to temperatures of about -20 degrees Celsius (°C) or lower. However, the new AGM Glory series of rugged Android phones has a power-pack rated to function for a time at -40°C. They also have a 5G Qualcomm processor, 8GB of RAM, a 48MP main camera and more.
https://www.notebookcheck.net/The-AGM-Glory-is-a-smartphone-designed-to-survive-at-temperatures-as-low-as-40-C.576473.0.html