T-Mobile Adds Free Wi-Fi Calling

After a few years, however, even after making the add-on price as low as $10/mo for a family plan for unlimited calls that started on Wi-Fi (either placed or received on a Wi-Fi network at home or a hotspot), T-Mobile stopped offering the service to new customers. Apparently, it continued to be available as a calling option, with Wi-Fi calls being deducted from general minute pools.