I would prefer the device without the phone. This way it would be much easier to carry. Much like one carries a PSP or other entertainment device. Plus then one could carry a very nice small phone for calls and texting. Therefore if you were on the web or playing a game etc, a phone call would not be a complete interruption.
Here is and excerpt from an article articulating this:
" The iPhone is an attempt to create a phone + media entertainment device. It'll be interesting to see how the iPhone does in the market -- it was an obvious move to combine a communicator with a phone, but it's not as obvious that the entertainer is a natural match with a phone. The danger to Apple will be if users see iPhone as the worst of both worlds: a phone that lacks a good keypad and an iPod with very small memory. "
source:
http://mobileopportunity.blogspot.co...bile-data.html