Samsung, the world’s biggest maker of smartphones, posted its slowest profit growth since 2011 as new Appl iPhones lured high-end customers and gains in the Korean won curbed the value of overseas sales. Net income, excluding minority interests, rose 5.4 percent to 7.22 trillion won ($6.7 billion) in the three months ended Dec. 31, the Suwon, South Korea-based company said in a filing today. That’s the slowest since profit fell in the third quarter of 2011.