By Reuters Staff 2 Min Read FILE PHOTO: A Huawei logo is seen at the Mobile World Congress (MWC) in Shanghai, China February 23, 2021. REUTERS/Aly Song SHANGHAI (Reuters) - China’s Huawei Technologies Co Ltd, once the world’s biggest smartphone maker, saw its phone shipments to retailers and other sellers within China plunge by half in the first quarter, as U.S. sanctions on its supply chain crimped expansion even as the overall smartphone market rebounded. The company shipped a total of 14.9 million handsets within China in the quarter ending in March, down from 30.1 million in the same period last year, according to research firm Canalys.