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 charges are the same as regular mobile calls. On iPhone, enable it via Settings > Phone > Wi-Fi Calling.
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.
The latest Wi-Fi 7 (IEEE 802.11be) 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.