The ability to send and receive SMS messages using a Wi-Fi connection on devices running the Android operating system allows communication even when cellular service is limited or unavailable. This functionality essentially routes text messages over an internet protocol (IP) network instead of the traditional cellular network. For example, an individual in a building with poor cellular reception but a strong Wi-Fi signal can still exchange text messages.
This capability extends communication reach and reduces reliance on cellular infrastructure. It offers cost savings in certain scenarios, particularly when roaming internationally or when cellular plans have limited text messaging allowances. The development of this feature has been driven by the increasing prevalence of Wi-Fi networks and the demand for consistent connectivity regardless of location or cellular signal strength. It has become a standard feature on many modern Android devices due to the benefits it provides to users.