Wi-Fi is a wireless LAN technology brand based on IEEE 802.11 standards. Devices certified by the Wi-Fi Alliance are guaranteed interoperable, covering smartphones, computers, tablets, and IoT devices. Users connect to the internet through home routers or public Wi-Fi hotspots at cafes, stations, and other venues.
For telephony, Wi-Fi Calling is significant. It enables voice calls over Wi-Fi when cellular signal is weak, such as inside buildings or underground. Call quality matches carrier VoLTE, and calls are billed under your carrier's voice terms. On iPhone, open Settings > Cellular > Wi-Fi Calling and switch it on.
Public Wi-Fi security risks require caution. Unencrypted free Wi-Fi allows third-party interception of communications. "Evil Twin" attacks set up fake hotspots to steal personal information. When using public Wi-Fi, use VPN, browse only HTTPS sites, and disable auto-connect.
Wi-Fi 7 (IEEE 802.11be), whose certification began in 2024, achieves up to 46Gbps speeds with significantly reduced latency, supporting high-quality video calls and large data transfers. Tethering to use smartphones as Wi-Fi routers is also widespread. Lost smartphone response covers Wi-Fi-based device tracking.