Nokia has received approval from Chinese authorities to sell its mobile phone business to Microsoft, it said on Tuesday, and added the companies expect the deal to close in April. Nokia agreed in September to sell the business to Microsoft in a 5.4 billion euro ($7.4 billion) deal. Nokia and Microsoft have now received regulatory approvals from the Peoples Republic of China, the European Commission, the U.S. Department of Justice and numerous other jurisdictions, Nokia said in a statement.