does anyone know how to use a prepaid phone card?

I am going to terminate my sprint contract at the end of this month, and start using the prepaid phone card.Can I still keep my phone number(the one sprint gave me)? and i wanna know how the whole pre-paid phonecard thingy works.How about my address book from the phone? will they be automically erased if i terminate my contract with sprint?
I am so lost.:(

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