4. Huawei Ascends
Landing in fourth place in worldwide smartphone sales was Huawei, which sold 9.9 million units in the first quarter of 2013, nearly doubling its unit sales from the same quarter a year ago. IDC attributes this growth to the company's increased development of the Huawei Ascend, an Android-based smartphone it sells under its own brand. Huawei's prior strategy relied heavily on rebranded feature phones and a limited Ascend presence outside the Asia/Pacific region, the report said. Huawei is clearly one to watch.