Google’s Android platform and Apple’s iOS regained mobile operating system market share last month after both mobile platforms curiously showed declines in December. Analytics firm Net Applications on Wednesday released mobile phone and tablet operating system share data for January 2012, and the new numbers suggest that Android showed the biggest gains last month. Google’s mobile OS remained in the No.3 spot while rising to an 18.12% share from 16.15% in December, while Apple’s iOS rose to 53.65% from 52.10% a month earlier. RIM’s BlackBerry OS showed gains in December but the platform’s OS share fell to 2.59% in January, its lowest point since October 2011. Java ME retained its No.2 position despite sliding to 19.19% from 21.27% last month, and Symbian dropped half a point to represent 5.20% of the mobile OS market. A chart outlining Net Applications’s data follows below.