A:AnswerHello there, k10. That is an interesting question, and one I would be happy to provide you some information on. WiFi Calling is a feature provided by T-Mobile and is only available to carrier specific devices and is only able to reach other T-Mobile devices with video calling enabled. This feature will not come pre-installed on an unlocked device. I would recommend reaching out to your carrier for compatibility and feature questions. Have a great day.