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What kind of account? For Post-Paid you can get a new number although I believe it is a $15 fee and you don't need a new SIM card.
For Pre-Paid I will let someone else answer that one since not sure how the numbers are assigned and/or tied to the SIM cards.
You do know you with Samsung phones you can block a number so it doesn't ring? They can still actually leave a message but you will never see the phone ring.