A device indicating a state of being disconnected from a network, typically either a Wi-Fi network or a cellular data network, signifies its inability to access online services or transmit data. An example includes a mobile phone displaying a notification that it has lost connection, preventing access to the internet or sending/receiving calls and messages using data.
Maintaining consistent network connectivity is crucial for utilizing a smartphone’s full range of functions, including communication, information access, and application usage. Connectivity failures can severely limit a device’s utility. Historically, early mobile phones relied exclusively on cellular networks for all communication, but the introduction of Wi-Fi capabilities broadened connectivity options and potential points of failure.