iPhone says "Phone Not Allowed" in settings ?

Hi all, I have a question, I activated my SIM card, however, I have a problem.
In my phone's settings, when I go in about, it does say "Carrier : Fizz 34.1".
But in Network at the top, it shows "Not Available".
When I click on "Not Available", it says the following : "Phone Not Allowed".
What does that mean ? (I attached a photo)
Everything is up to date but it refuses to work.
Here's the thing, could it be because this was purchased in the U.S as an ex T-Mobile phone that was then unlocked ?
My IMEI is : 35930706118832
Could an employee look into this ?


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