iPhone 7 suddenly says invalid sim and won't connect to network

magenta2885739

    I don't know what happened. I activated my new iPhone 7 a couple months ago and all was fine until this morning when I got this weird message. I powered my phone off and on a couple times and tmobile service came back on for a few hours.  Now I am getting the same invalid sim message and can't use my phone.  Please help.

    laura

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