Wi-Fi Calling: Capable phone and Wi-Fi connection required for Wi-Fi Calling; may decrement plan minutes. Most devices will not transition between Wi-Fi and the wireless network. See your selected service for details. Wi-Fi: Capable device and Wi-Fi connection required. Device will not transition between Wi-Fi and the cellular network. Devices using wireless connections may be vulnerable to unauthorized attempts to access data and software stored on the device. Plan data allotment applies to use by connected devices sharing Wi-Fi. Use of connected devices subject to T-Mobile’s Terms and Conditions.