My last two phones (Xiaomi 9T and Pixel 7) have struggled below about -5C. They still work but the battery drops very quickly so you can't rely upon them. Kee

My last two phones (Xiaomi 9T and Pixel 7) have struggled below about -5C. They still work but the battery drops very quickly so you can't rely upon them. Keeping them in an inner pocket works but I then take them out and see the battery drop. The sudden temperature change might not help there.