what does blackjack pay

if I have my old ATT SIM I put in a Blackjack 2 with no problems or pay an additional fee?
Im thinking of buying a Blackjack 2, but not want to pay additional costs. We also want to make sure it works.
While the SIM card is connected to an active line of service provided you put a SIM card phone from AT & T should work, but the iPhone … Things get a little more complicated with it! But with the blackjack 2 you should be fine, just may need some type of packet data so you do not run your bill! I saw this happen several times.
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