Samsung - a South Korean multinational conglomerate known for producing a wide range of electronic devices, including smartphones.
Apple - an American multinational technology company known for producing high-end smartphones, such as the iPhone.
Huawei - a Chinese multinational technology company that produces a range of electronic devices, including smartphones.
Xiaomi - a Chinese multinational electronics company that produces smartphones, among other electronic devices.
Oppo - a Chinese multinational electronics and technology company that produces smartphones, among other electronic devices.