Research firm IDC yesterday released its estimates on worldwide mobile phone sales for the first quarter of 2013, showing Apple losing some ground in the smartphone market with only 6.6% year-over-year growth compared to 41.6% growth for the entire market. Still, Apple maintained a firm grasp on the number two spot behind Samsung, as challengers LG, Huawei, and ZTE were unable to reach the 5% mark during the quarter. Worldwide Smartphone Shipments in 1Q13 in Millions of Units (Source: IDC)Apple's smartphone shipment volume hit a new first-quarter high thanks in part to the iPhone 5, with volume growing 6.6% year over year. However, the last time the iPhone maker posted a single-digit year-over-year growth rate was
