HSBC and its subsidiary Hang Seng Bank had resumed mobile phone service operations by early Monday afternoon after an outage in the morning locked customers out of their accounts for several hours. HSBC, the biggest lender in the city with over 7 million customers in Hong Kong, had its mobile banking service interrupted, with many customers complaining they could not log on to the system on Monday morning. More than 10 HSBC customers contacted the South China Morning Post, saying they were...