Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets.

iOS is a mobile operating system developed by Apple Inc. and distributed exclusively for Apple hardware.

Windows Phone is a mobile operating system developed by Microsoft. It was discontinued in 2017.

BlackBerry OS is a mobile operating system developed by BlackBerry Limited. It was discontinued in 2020.

Samsung is a South Korean multinational manufacturing company headquartered in Samsung Town, Seoul. It is the largest mobile device manufacturer in the world.

iPhone is a line of smartphones designed and marketed by Apple Inc. It is the company's flagship smartphone.

Google is an American multinational technology company headquartered in Mountain View, California. It is the world's largest search engine company.

Mate is a line of smartphones designed and marketed by Huawei. It is the company's flagship smartphone.

OnePlus is a Chinese smartphone manufacturer headquartered in Shenzhen, Guangdong. It is known for its high-end smartphones.

Pro is a line of smartphones designed and marketed by OnePlus. It is the company's flagship smartphone.

Xiaomi is a Chinese multinational electronics company headquartered in Beijing. It is the world's third-largest smartphone manufacturer.

Mi is a line of smartphones designed and marketed by Xiaomi. It is the company's flagship smartphone.

Realme is a Chinese smartphone manufacturer headquartered in Shenzhen, Guangdong. It is known for its budget-friendly smartphones.

GT is a line of smartphones designed and marketed by Realme. It is the company's flagship smartphone.

Vivo is a Chinese smartphone manufacturer headquartered in Dongguan, Guangdong. It is the world's fifth-largest smartphone manufacturer.

X is a line of smartphones designed and marketed by Vivo. It is the company's flagship smartphone.