Find answers to commonly asked questions about Wi-Fi Calling.
To use Wi-Fi Calling, you need a supported T-Mobile Wi-Fi Calling-capable phone and Wi-Fi Internet access.
For information about setting up Wi-Fi Calling on your phone, check out the How-to guides for your device on the Devices page.
This error indicates that the SIM may not be able to connect to the T-Mobile network. See "Invalid SIM error."
When you dial 911 while using Wi-Fi Calling, your location may not be automatically provided to the dispatcher.
For Pay In Advance prepaid lines, calls made over Wi-Fi deduct from the plan bucket just like regular calls.
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