Xiaomi says its new Redmi Note 4 has become the fastest selling smartphone in India. The Chinese firm said it had moved more than one million units in just 45 days since its launch, meaning one sold every four seconds. The phone is the successor to the Redmi Note 3, which shifted more than 2.3 million units in the country following its 2016 launch, making it the best-selling smartphone in India in terms of online sales. "Redmi Note 4 has become the fastest smartphone model to sell a million units in India. Redmi Note 4 has sold more than one million units in 45 days from its first sale on 23 January, 2017," Xiaomi said.