I'd bought these for a trip to Iceland so that I could use my touchscreen phone while wearing glove and they serve the purpose. Only downside is they get wet soon in the rain. Otherwise perfect for cold and dry weather.
Only used, after removing outer ski glove, but only to operate a go-pro, didn't actually use to operate a smart phone, as weather warm enough to not require glove liners.
Kept hands warm when removing outer ski glove
Not tested to full compliance with smart screen.