You do know NOKIA were already making touchscreen devices don't you? A touchscreen wasn't some amazing revelation to them. Symbian had touch support baked in since it was called Epoch32 and run on Psion PDAs.

NOKIA's real problem was clunky old hardware, too low-powered and ugly to do their excellent software justice. It was only the remarkable efficiency of their software that enabled it to run on such modest hardware, slothful operating systems like iOS and Windows Phone certainly wouldn't have been able too.

Now NOKIA are doing much better hardware but they've partnered with a company with a world wide reputation for unstable, insecure software.