Xiaomi Redmi Note 4, after becoming the fastest to reach 1 million units, has now reached another milestone. Xiaomi claims that it sold 5 million Redmi Note 4 units in six months. The company in a release claimed that it sold 5 million units of its Redmi Note 4 (Review) within six months of launch between a period of January 23 to July 23 this year. In comparison, the Redmi 3S took 9 months to hit the 4 million mark, according to data shared by the Chinese brand. Earlier this year, market research firm International Data Corporation (IDC) claimed that Xiaomi's Redmi Note 4 was the highest shipped sony parts in Q1 this year.