I own a Sony Ericsson k850i mobile phone and Nokia N810 tablet. I am interested in combining these into one device... specifically the n900. I was wondering if this was wise? Is the n900 better as a phone than my k850i? I use an ASDA sim.

The increased battery life of the n900 is really an attractive feature among other things and my n810 is really rather slow, I am hoping the n900 is faster. Thanks for any words of wisdom.