Cold weather and touchscreen smartphones do not go together hand in glove.
Every time you need to take a call, you have to take a glove off. Why? Because wool just doesn't work on a touchscreen. Luckily, one canny manufacturer has stitched special conductive lining into the thumb, forefinger and middle finger of this pair of 'faux wool' (acrylic) gloves. The result is a fully functional phone and non-frozen fingers. They cost €15 including delivery from Firebox.com.
Alternatively, if you're still not getting a purchase on your touchscreen, you can try these forefinger-less gloves from Etre. They cost €35 (including delivery).