The search is on to identify the actual manufacturer behind the US$499 Trump Mobile T1 smartphone, as most supply chain analysts cast doubt on the claim by the US president’s family that the device could be “proudly designed and built in the United States.” China, the world’s largest smartphone market since 2011, is also the hub of global manufacturing, with estimates ranging from a low of 60 per cent to a high of 80 per cent of worldwide production. One in three of the 187 disclosed suppliers...