Random thoughts for a Friday.

I was going to buy a new phone and then thought how about a tablet instead?  

I don't do many voice calls, mainly communicate via facebook or whatsapp.
As I spend up to 2 hours commuting per day on a bus, a tablet would be good for:

Games
Watching Movies
listening to music
surfing etc...

If I can do all this on a tablet then what do I need a phone for?  
Screen size on a phone is just too small for some of those tasks - I intend to get a tablet anyway so why not just ditch the phone at the same time?

Obviously the size of a tablet is an issue for some - but I don't mind it...
Can you get a 3g plan for a tablet that includes voice?

So, buying a tablet instead of a phone - have you thought about this before or have you done this already? 

Apart from the size and possibly lack of voice capability what other problems might there be with this idea?