Sideline is designed to use the minutes from your carrier to let you place and receive calls. Included in the Sideline Subscription, you can use WiFi to connect calls over your internet connection as an alternative to using your cellular network.
When connected to WiFi, VoIP calling won't use up your minutes and will help you avoid any fees. You can find this in your Settings under "VoIP Calling".
Additionally, if at any time you are abroad, you can use WiFi to place calls to U.S numbers and not be charged for international calling fees or data.
Please note: If you have this feature enabled, and you are experiencing poor call quality, please disable and retest the quality of your calls.
*Data and Internet connectivity are still required for general functionality. “Using your carrier network,” makes call quality more reliable than calls over VoIP or Wi-Fi.