Group FaceTime not working? Here are 8 ways to fix it today!

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If you can't connect to the internet, you won't be able to use T-Mobile Video Calling. Check out Internet and data issues. T-Mobile Video Calling only works with T-Mobile U.S. customers using supported phone models. If the contact is compatible, a green camera icon shows up in your phonebook, confirming both of you are compatible.

[Solved] FaceTime Icon Greyed Out in Contacts