How do I change previous user info for Sprint Sierra wireless card?

Captain

New member
I have wireless internet with Sprint for my laptop and they sent me the Sierra Wireless USB 598U card. It works GREAT! I disconnected my home internet and went on Ebay and bought two more cards for my home computers since I already have a wireless acct. with Sprint, but the new cards aren't working.... the previous owner's info is still in the memory banks. How do I change these cards to work under my acct?
 
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