Wi-Fi Calling Lets Phones Make Clear Calls Indoors Without Cellular Signal

Many phones quietly enable Wi-Fi Calling by default, allowing voice calls to connect over a Wi-Fi network even when no mobile signal bars appear. The call is routed through an encrypted tunnel to the operator's core network, which hides its contents from the local Wi-Fi owner and makes the call appear as a normal call from the user's usual number. Phones can also hand a live call back to the cellular network when signal returns, though the switch can occasionally cause a brief pause or dropped call. The feature is especially useful in offices, basements, rural homes, and buildings with thick walls where cellular coverage is weak. The article notes that the capability is built into the phone's dialer and does not require a separate app.