So essentially, using a Kindle as a cellphone, since there the same size now? That is just ridiculous to even fathom seeing someone talk on the phone with this "e-reader" sized mamoth. This is what happens when devs overhear the talk on the web "well my phone is bigger than yours" or "well my phone is 4.5" instead of your little 3.5" talks, and just go in with the bigger is always better mentality. At this rate, in 2 years, I'm going to be using a 10" tablet to talk on the screen. :\
Seriously people, I laughed at the thought of smartphones becomming the size of a GPS and now they have. I remember when they tried to make cellphones as small as they could.