I need mobile phone help, pretty please.

Hi guys and guyesses,
I own a clapped out mobile phone from around about 2005 running on o2 and a Samsung Galaxy Note 10.1 tablet PC. I use the tablet mostly for e-book reading with a bit of web browsing thrown in when connected to our home network. I also do a bit of photo taking plus it gets used for GPS now and again.
As you can imagine, I need a new phone and I got the idea of combining the two gadgets. I could get a Smart phone but then I wouldn't have the screen size of the tablet but, in fact, the 10.1 inch screen is a little bit on the large size so I would hope to bring the size down a bit. Maybe down to 8" or so.
The question is, is there anything in the Samsung range that would do the trick and give me the web browsing freedom of my tablet and also let me make and receive phone calls just like a standard mobile phone. I'd really like to stick with Samsung 'cos I have had my tablet for over a year and I'm pretty impressed with the quality of it. It doesn't need to be brand new, in fact, used is better because my price limit is around