I always wear a watch when I'm out of the house.
I need to have an accurate time as I use trains as my primary form of transport, without accurate timing travelling by train can be a nightmare.
You can fit all the key hardware for a mobile phone in a watch now, tie that in with a bluetooth headset and AS A PHONE, you would have an attractive product for me.
I don't play games on my phone, I write them, but I don't play them.
I don't listen to music on my phone, I personally think anybody who walks around with a pair of headphones on is an idiot. The world is too dangerous to cut off your primary defensive sensor system just for the sake of a bit of music.
I don't surf the web on my phone, I have a laptop for that
So for me, most of the features of a modern mobile are a waste of space.
During the winter, I don't mind carrying around a phone. It goes in my jacket pocket and is there if needed.
In the summer, I hate it. I have to wear a shirt with a breast pocket, it goes in there and I'm constantly aware of it's weight and the possibility of it falling out of my pocket.
A phone in a watch would be great for me, I would just need some easy way of storing the headset so I wouldn't need to wear it all the time.