Cell phones are hard to use in the winter unless you have your fingers free from mittens. Keep your hands warm while using your phone! Add the curls or not, that is up to you.
I suggest you try them on while you knit. Everyone has different size hands. If they seem too small, add 4 extra stitches. For a man you may need to add 8 extra.
I love playing with new designs. My patterns are easy and intended to keep the new knitter knitting!