comScore just released its latest monthly mobile numbers, which chart mobile phone usage for a three-month average period ending in May 2012. During this time, 234 million Americans age 13 and older used mobile devices, which is consistent with the company's previous report from February. Samsung ranked as the top handset manufacturer overall with a 25.7% market share, and Android came out on top, too, with a 50.9% share versus Apple's 31.9%.