I have no interest in carrying a cell phone and being leashed to harassment by customers and employers 24x7. Leave a message on my landline or send an email -- I'll get back to you when I have time, not cater to your impatient demands for instant service impinging on my personal life.
Seeing as I don't want to carry around a phone all the time, what I want is a tablet device that will let me use a stylus to scribble notes and diagrams, a true replacement for pen and paper.
I want the option of having those scribblings analyzed for text content, graphical components, and an interface to clean up those scribblings and turn them into a proper document on my home/main system when I get back from collecting notes at a client site.
It might be nice to have 4G and phone connectivity from the tablet device, maybe even skype video conferencing support, but I'd rather just clip a bluetooth headset to my ear and have it talk to the tablet than deal with an actual cell phone.
If you want to get fancy, let me use the bluetooth headset to "command" the tablet through a voice interface. I don't mean being able to say "Select File. Select Save As.
In short, I'm still waiting for someone to follow through and bring Alan Kay's ideas to market instead of trying to tell me that being able to play "Angry Birds" is more innovative and useful than being able to take notes.