3 key characteristics of mobile phones are: PortabilityMobile phones are designed to be easily carried, allowing users to communicate and access information from almost anywhere. Their compact size makes them convenient for on-the-go use.ConnectivityMobile phones connect to cellular networks via base stations or mobile towers, enabling communication over long distances without wires. They also offer various connectivity options such as Wi-Fi and Bluetooth for internet access and data transfer.MultifunctionalityModern mobile phones, especially smartphones, offer a wide array of functions beyond just making calls. These include web browsing, email, social media, photography, gaming, and running various software applications. They often serve as personal organizers, with features like calculators, clocks, and phonebooks.