Wi-Fi calling is a voice service that lets users place and receive calls over a wireless internet connection, as opposed to using a cellular signal. Smartphone users can make use of Wi-Fi calling to talk and text on their smartphones from locations where it's difficult to reach a strong cellular phone signal. Typically, the term refers to cellular calls, as opposed to texting.
Most users are familiar with the process of using Wi-Fi to send messages via Short Message Service, or SMS. Wi-Fi calling is the ability of a Wi-Fi network to facilitate voice or video calls. By default, Wi-Fi calling connects users to a Wi-Fi network so they don't have to use mobile data to place these calls. The service can be used domestically and internationally from most countries.
Wi-Fi calling is available on most Android and iOS devices, and the user experience is like any other phone call. However, the experience and call quality may be affected by the number of people using a Wi-Fi hotspot or if the network connection is faulty and prone to call disruptions.