I'm looking to upgrade my mobile in the next couple of months, possibly to a Sony Ericsson Experia X10, but heard that it only comes with android 1.6 when 2.1 is out and 2.2 is to follow soon - can you upgrade the OS on this phone? Also thinking about upgrading to iphone 4 as an alternative - any ideas as to which is better or does anyone have any other recommendations?