Huawei is the largest supplier of mobile network infrastructure in China, and the second largest in the world. Their expertise in this area also translates into devices like modems, set top boxes, and mobile handsets; most of these are hidden behind other brand names — you may be using Huawei-manufactured products already and not even know it!
Huawei recently started selling mobile phones under its own brand name, and today ships tens of millions of handsets worldwide. Most of their offerings in the UK have been aimed at the budget end of the smartphone market, on a range of different operating systems.
Nearly half of all Huawei's employees work in research and development, in research institutes based in the USA, Germany, Sweden, Russia, India, and China. To date Huawei owns nearly 20,000 patents on various telecommunications technologies. That's some serious expertise!