Usage of Apple’s iOS platform and Google’s Android operating system both declined between November and December as BlackBerry and Symbian both showed gains. Despite huge activations over the holidays, new data released by analytics firm Net Applications shows that Internet usage of iOS on Apple’s iPhone and iPad displayed the sharpest decline in December, dropping to 52.10% from 54.04% in November. Google’s Android platform on smartphones and tablets dipped less than half a point to 16.29% in December but it stayed in the No.3 spot as Java ME gained more ground, climbing to a 21.27% share last month. Also showing usage gains in December were RIM’s BlackBerry platform, up to 3.51% from 3.18% in November, and Symbian, which climbed to 5.76% from 5.27% a month earlier. A chart outlining Net Applications’s data follows below.