Iphone says your iphone can't be activated bc the activation server is temporarily unavailable?

I called the carrier i have and they said to reset my phone so i did it still just says this i can't even use my phone what do i do

BECAUSE YOUR AREA DOES NOT COVER IPHONE SERVICE RANGE THAT YOU ENROLLED, TRY ANOTHER SUPPLIER.

Try again later.

It did say it was temporarily unavailable.

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