Prepaid Sim In Unlocked Phone?

Rye

New member
Recently my (contract) at&t phone was stolen by my uncle's friend
so i brought a prepaid cellphone and activated it to work with my contract.
However i have Two questions about the sim card.

(1)Should i keep using my prepaid at&t sim or should i just buy a new (at&t) one?

(2)Will At&t ask me what phone i will be using when i Activate my new sim?

--All Advice Is Taken-- Thank You :)
 
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