[Q] simcard from unknown source Samsung Galaxy tab 4 t337

Sir please help me. I bought a tablet Samsung Galaxy tab 4 4g lte, the guy from best buy told me that's it is fac tory unlocked, when I inserted a different sim card.it says sim card from unknown source but it has a signal on signal bar and I tried to start data connection but it doesn't show the up and down arrow that confirms you are connected, please help me.

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