A four-year-old Chinese tech company has become the world's third-largest smartphone maker, behind by for from in of over to up with Samsung and Apple. The company is called Xiaomi Inc. It has also become the world's most valuable tech start- behind by for from in of over to up with and is more valuable than Uber, Dropbox, Pinterest and Snapchat. The Beijing-based company just raised $1.1 billion behind by for from in of over to up with funding and is now worth $45 billion. That makes it worth more than tech giants LG, Motorola and Sony put together. Xiaomi is also the world's fastest-growing smartphone maker. Its sales increased behind by for from in of over to up with 211 per cent behind by for from in of over to up with 2014. Its market share has also increased behind by for from in of over to up with 2 per cent behind by for from in of over to up with 5 per cent behind by for from in of over to up with the past year and it looks like that will increase further. Xiaomi has a unique business model. It sells its phones behind by for from in of over to up with around what they cost to make. Profits come behind by for from in of over to up with apps and software. It also makes its customers follow the company. Many Xiaomi users behind by for from in of over to up with China are very loyal fans behind by for from in of over to up with the company. The company uses marketing campaigns that give fans the chance to win prizes. This makes the company very popular. Bin Lin, Xiaomi co-founder and president, said: "We will strive to continue bringing innovation behind by for from in of over to up with everyone, behind by for from in of over to up with a goal behind by for from in of over to up with producing high-quality, high-performance devices behind by for from in of over to up with great user experience." However, not everyone is a fan behind by for from in of over to up with Xiaomi. Apple's chief designer Jonathan Ive said Xiaomi stole the design behind by for from in of over to up with its phone and many ideas behind by for from in of over to up with Apple.