Wi-Fi Calling FAQs

    Find answers to commonly asked questions about Wi-Fi Calling.

     

     

    What do I need to use Wi-Fi Calling?

    To use Wi-Fi Calling, you need a supported T-Mobile Wi-Fi Calling-capable phone and Wi-Fi Internet access.

     

     

    How do I set up Wi-Fi Calling on my phone?

    For information about setting up Wi-Fi Calling on your phone, check out the How-to guides for your device on the Devices page.

     

     

    Why am I receiving an "Invalid SIM" message?

    This error indicates that the SIM may not be able to connect to the T-Mobile network. See "Invalid SIM error."

     

     

    Why does Wi-Fi Calling need an e911 address?

    When you dial 911 while using Wi-Fi Calling, your location may not be automatically provided to the dispatcher.

     

     

    How are calls and messages over Wi-Fi Calling billed?

    Calls

    • For Simple Choice plans, Wi-Fi calling uses monthly plan minutes for the following:
      • Calls made from the U.S. to U.S. numbers
      • Calls made from the US to international numbers (subject to international rates)
      • Calls made from outside the U.S. to U.S. numbers (not charged roaming)
    • All incoming calls received over Wi-Fi calling are $0.
    • Wi-Fi calls placed to countries other than the U.S. from outside the U.S. are subject to the following:
      • If you have a Simple Choice rate plan:
        • Wi-Fi calls made from any Simple Global country to any other country are $0.20/min (same as cellular).
        • Wi-Fi calls made from non-Simple Global countries to other countries are charged at World Class rates.
      • If you do not have a Simple Choice rate plan, Wi-Fi calls made to other countries are charged at World Class Calling rates.
      • Keep in mind, you must disable data roaming when traveling internationally to avoid incurring data roaming charges. For more information, see International roaming services.

       

      Messages

      • All text messages (SMS) and picture messages (MMS) you receive over Wi-Fi are $0.
      • SMS/MMS you send to the U.S. over Wi-Fi from anywhere are $0.
      • SMS/MMS messages you send over Wi-Fi internationally (that is, to a country other than the U.S. from a country other than the U.S.) are subject to the following:
        • $0 if the messages are sent while roaming in a Simple Global country
        • $0.50 if the messages are sent while roaming in a non-Simple Global country

       

      For Pay In Advance prepaid lines, calls made over Wi-Fi deduct from the plan bucket just like regular calls.