Yes, I know, who knits a sock for a phone? Answer someone who doesn't wear pockets. I quite often head out with just my keys and the phone, the keys are on a lanyard but the phone is in my hand. It is very annoying. So I made myself a phone sock, I'm happy with it.
Here's how I did it8 ply wool
2 4mm circular needles
Cable pattern
Rows 1 & 2: P1, K8, P1
Row 3: P 1, K2, C4F, K2, P1
Rows 4 & 5: row 1
Row 6: P1, C4B, C4B, P1
Row 7 & 8 Row 1
Row 9: Row 3
Row 10: Row 1
Phone sock
Cast on 12 (min of 10st even number) on each needle using Judy Becker’s Magic Sock Cast on http://www.knitty.com/ISSUEspring06/FEATmagiccaston.html
Start cable pattern from row 1
Increase to 20 (or whatever your phone needs), following cable pattern.
Continue following cable pattern until sock is big enough for your phone.
Cast off, but don’t finish off.
Change to crochet hook, slip sti into first cast of stitch to neaten end.
Chain 40 cm
Slip stitch to other side of sock top.
DC all the way back around the chain.
Slip stitch, finish off.
